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NAME

       xorg.conf - configuration File for Xorg X server

INTRODUCTION

       Xorg  supports several mechanisms for supplying/obtaining configuration
       and run-time parameters: command line options,  environment  variables,
       the   xorg.conf   configuration   file,  auto-detection,  and  fallback
       defaults.  When the same information is supplied in more than one  way,
       the  highest  precedence  mechanism is used.  The list of mechanisms is
       ordered  from  highest  precedence  to  lowest.   Note  that  not   all
       parameters can be supplied via all methods.  The available command line
       options and environment variables (and some defaults) are described  in
       the  Xserver(1)  and  Xorg(1)  manual  pages.   Most configuration file
       parameters, with their  defaults,  are  described  below.   Driver  and
       module  specific configuration parameters are described in the relevant
       driver or module manual page.

DESCRIPTION

       Xorg uses a configuration file called xorg.conf for its initial  setup.
       This  configuration  file  is searched for in the following places when
       the server is started as a normal user:

           /etc/X11/<cmdline>
           /usr/etc/X11/<cmdline>
           /etc/X11/$XORGCONFIG
           /usr/etc/X11/$XORGCONFIG
           /etc/X11/xorg.conf-4
           /etc/X11/xorg.conf
           /etc/xorg.conf
           /usr/etc/X11/xorg.conf.<hostname>
           /usr/etc/X11/xorg.conf-4
           /usr/etc/X11/xorg.conf
           /usr/lib/X11/xorg.conf.<hostname>
           /usr/lib/X11/xorg.conf-4
           /usr/lib/X11/xorg.conf

       where <cmdline> is a relative path (with no “..” components)  specified
       with  the -config command line option, $XORGCONFIG is the relative path
       (with no “..” components) specified by that environment  variable,  and
       <hostname>    is    the    machine’s    hostname    as    reported   by
       gethostname(__oslibmansuffix__).

       When the Xorg server is started by the “root”  user,  the  config  file
       search locations are as follows:

           <cmdline>
           /etc/X11/<cmdline>
           /usr/etc/X11/<cmdline>
           $XORGCONFIG
           /etc/X11/$XORGCONFIG
           /usr/etc/X11/$XORGCONFIG
           $HOME/xorg.conf
           /etc/X11/xorg.conf-4
           /etc/X11/xorg.conf
           /etc/xorg.conf
           /usr/etc/X11/xorg.conf.<hostname>
           /usr/etc/X11/xorg.conf-4
           /usr/etc/X11/xorg.conf
           /usr/lib/X11/xorg.conf.<hostname>
           /usr/lib/X11/xorg.conf-4
           /usr/lib/X11/xorg.conf

       where  <cmdline>  is  the  path specified with the -config command line
       option (which may be absolute or relative),  $XORGCONFIG  is  the  path
       specified by that environment variable (absolute or relative), $HOME is
       the path specified by  that  environment  variable  (usually  the  home
       directory),  and  <hostname>  is  the machine’s hostname as reported by
       gethostname(__oslibmansuffix__).

       The xorg.conf file is composed of a number of  sections  which  may  be
       present in any order.  Each section has the form:

           Section  "SectionName"
               SectionEntry
               ...
           EndSection

       The section names are:

           Files          File pathnames
           ServerFlags    Server flags
           Module         Dynamic module loading
           InputDevice    Input device description
           Device         Graphics device description
           VideoAdaptor   Xv video adaptor description
           Monitor        Monitor description
           Modes          Video modes descriptions
           Screen         Screen configuration
           ServerLayout   Overall layout
           DRI            DRI-specific configuration
           Vendor         Vendor-specific configuration

       The   following   obsolete  section  names  are  still  recognised  for
       compatibility purposes.  In new config files, the  InputDevice  section
       should be used instead.

           Keyboard       Keyboard configuration
           Pointer        Pointer/mouse configuration

       The old XInput section is no longer recognised.

       The ServerLayout sections are at the highest level.  They bind together
       the input and output devices that will be used in a session.  The input
       devices  are  described  in  the  InputDevice sections.  Output devices
       usually consist of multiple independent components  (e.g.,  a  graphics
       board  and a monitor).  These multiple components are bound together in
       the Screen sections, and  it  is  these  that  are  referenced  by  the
       ServerLayout  section.   Each  Screen section binds together a graphics
       board and a monitor.  The graphics boards are described in  the  Device
       sections, and the monitors are described in the Monitor sections.

       Config  file  keywords  are  case-insensitive,  and  “_” characters are
       ignored.   Most  strings  (including  Option  names)  are  also   case-
       insensitive, and insensitive to white space and “_” characters.

       Each  config  file  entry  usually  takes up a single line in the file.
       They consist of a keyword, which is possibly followed by  one  or  more
       arguments,  with the number and types of the arguments depending on the
       keyword.  The argument types are:

           Integer     an integer number in decimal, hex or octal
           Real        a floating point number
           String      a string enclosed in double quote marks (")

       Note: hex integer values must be prefixed with “0x”, and  octal  values
       with “0”.

       A  special  keyword called Option may be used to provide free-form data
       to various components of the server.  The Option keyword  takes  either
       one  or  two  string  arguments.  The first is the option name, and the
       optional second argument is  the  option  value.   Some  commonly  used
       option value types include:

           Integer     an integer number in decimal, hex or octal
           Real        a floating point number
           String      a sequence of characters
           Boolean     a boolean value (see below)
           Frequency   a frequency value (see below)

       Note  that  all  Option  values,  not just strings, must be enclosed in
       quotes.

       Boolean options may optionally have a value specified.  When  no  value
       is specified, the option’s value is TRUE.  The following boolean option
       values are recognised as TRUE:

           1, on, true, yes

       and the following boolean option values are recognised as FALSE:

           0, off, false, no

       If an option name is prefixed with  "No",  then  the  option  value  is
       negated.

       Example: the following option entries are equivalent:

           Option "Accel"   "Off"
           Option "NoAccel"
           Option "NoAccel" "On"
           Option "Accel"   "false"
           Option "Accel"   "no"

       Frequency  option  values  consist  of a real number that is optionally
       followed by one of the following frequency units:

           Hz, k, kHz, M, MHz

       When the unit name is omitted, the correct  units  will  be  determined
       from  the  value  and  the expectations of the appropriate range of the
       value.  It is recommended that the units always be specified when using
       frequency option values to avoid any errors in determining the value.

FILES SECTION

       The  Files  section  is used to specify some path names required by the
       server.  Some of these paths can also be set from the command line (see
       Xserver(1) and Xorg(1)).  The command line settings override the values
       specified in the config file.  The Files section is  optional,  as  are
       all of the entries that may appear in it.

       The entries that can appear in this section are:

       FontPath "path"
              sets  the search path for fonts.  This path is a comma separated
              list of font path elements which the Xorg  server  searches  for
              font databases.  Multiple FontPath entries may be specified, and
              they will be concatenated to build up the fontpath used  by  the
              server.   Font  path  elements  can be absolute directory paths,
              catalogue directories or a font server identifier.  The  formats
              of the later two are explained below:

              Catalogue directories:

                  Catalogue  directories  can  be  specified  using the prefix
                  catalogue: before the directory name. The directory can then
                  be  populated  with  symlinks  pointing  to  the  real  font
                  directories, using the following syntax in the symlink name:

                      <identifier>:[attribute]:pri=<priority>

                  where    <identifier>   is   an   alphanumeric   identifier,
                  [attribute] is an attribute  wich  will  be  passed  to  the
                  underlying  FPE and <priority> is a number used to order the
                  fontfile FPEs. Examples:

                      75dpi:unscaled:pri=20 -> /usr/share/X11/fonts/75dpi
                      gscript:pri=60 -> /usr/share/fonts/default/ghostscript
                      misc:unscaled:pri=10 -> /usr/share/X11/fonts/misc

              Font server identifiers:

                  Font server identifiers have the form:

                      <trans>/<hostname>:<port-number>

                  where <trans> is the transport type to use to connect to the
                  font server (e.g., unix for UNIX-domain sockets or tcp for a
                  TCP/IP  connection),  <hostname>  is  the  hostname  of  the
                  machine  running  the  font server, and <port-number> is the
                  port number that the font server is  listening  on  (usually
                  7100).

              When  this entry is not specified in the config file, the server
              falls back to the compiled-in default font path, which  contains
              the  following  font  path  elements  (which can be set inside a
              catalogue directory):

                  /usr/share/X11/fonts/misc/
                  /usr/share/X11/fonts/TTF/
                  /usr/share/X11/fonts/Type1/
                  /usr/share/X11/fonts/75dpi/
                  /usr/share/X11/fonts/100dpi/

              The recommended font  path  contains  the  following  font  path
              elements:

                  /usr/share/X11/fonts/local/
                  /usr/share/X11/fonts/misc/
                  /usr/share/X11/fonts/75dpi/:unscaled
                  /usr/share/X11/fonts/100dpi/:unscaled
                  /usr/share/X11/fonts/Type1/
                  /usr/share/X11/fonts/75dpi/
                  /usr/share/X11/fonts/100dpi/

              Font path elements that are found to be invalid are removed from
              the font path when the server starts up.

       ModulePath "path"
              sets the search path for loadable  Xorg  server  modules.   This
              path  is  a  comma  separated list of directories which the Xorg
              server searches  for  loadable  modules  loading  in  the  order
              specified.   Multiple  ModulePath  entries may be specified, and
              they will be concatenated to build the module search  path  used
              by the server.

SERVERFLAGS SECTION

       In  addition to options specific to this section (described below), the
       ServerFlags section is used to specify some global Xorg server options.
       All   of  the  entries  in  this  section  are  Options,  although  for
       compatibility  purposes  some  of  the  old  style  entries  are  still
       recognised.  Those old style entries are not documented here, and using
       them is discouraged.  The ServerFlags section is optional, as  are  the
       entries that may be specified in it.

       Options   specified   in  this  section  (with  the  exception  of  the
       "DefaultServerLayout" Option) may be overridden by Options specified in
       the active ServerLayout section.  Options with command line equivalents
       are overridden when their command line equivalent is used.  The options
       recognised by this section are:

       Option "DefaultServerLayout"  "layout-id"
              This  specifies  the  default ServerLayout section to use in the
              absence of the -layout command line option.

       Option "NoTrapSignals"  "boolean"
              This  prevents  the  Xorg  server  from  trapping  a  range   of
              unexpected fatal signals and exiting cleanly.  Instead, the Xorg
              server will die and drop core where  the  fault  occurred.   The
              default  behaviour  is  for the Xorg server to exit cleanly, but
              still drop a core file.  In general you never want to  use  this
              option  unless you are debugging an Xorg server problem and know
              how to deal with the consequences.

       Option "DontVTSwitch"  "boolean"
              This disallows the use of the  Ctrl+Alt+Fn  sequence  (where  Fn
              refers  to one of the numbered function keys).  That sequence is
              normally  used  to  switch  to  another  "virtual  terminal"  on
              operating  systems  that have this feature.  When this option is
              enabled, that key sequence has no special meaning and is  passed
              to clients.  Default: off.

       Option "DontZap"  "boolean"
              This disallows the use of the Ctrl+Alt+Backspace sequence.  That
              sequence is normally used to terminate the  Xorg  server.   When
              this option is enabled, that key sequence has no special meaning
              and is passed to clients.  Default: off.

       Option "DontZoom"  "boolean"
              This  disallows  the  use  of   the   Ctrl+Alt+Keypad-Plus   and
              Ctrl+Alt+Keypad-Minus  sequences.  These sequences allows you to
              switch between video modes.  When this option is enabled,  those
              key sequences have no special meaning and are passed to clients.
              Default: off.

       Option "DisableVidModeExtension"  "boolean"
              This disables the parts of the VidMode  extension  used  by  the
              xvidtune  client  that  can  be  used to change the video modes.
              Default: the VidMode extension is enabled.

       Option "AllowNonLocalXvidtune"  "boolean"
              This allows the xvidtune client (and other clients that use  the
              VidMode  extension) to connect from another host.  Default: off.

       Option "DisableModInDev"  "boolean"
              This disables the parts of the XFree86-Misc extension  that  can
              be  used  to  modify  the  input  device  settings  dynamically.
              Default: that functionality is enabled.

       Option "AllowNonLocalModInDev"  "boolean"
              This allows a client to connect from  another  host  and  change
              keyboard  and  mouse  settings  in the running server.  Default:
              off.

       Option "AllowMouseOpenFail"  "boolean"
              This allows the server to start up  even  if  the  mouse  device
              can’t be opened/initialised.  Default: false.

       Option "VTSysReq"  "boolean"
              enables  the  SYSV-style VT switch sequence for non-SYSV systems
              which support VT switching.  This sequence is Alt-SysRq followed
              by  a function key (Fn).  This prevents the Xorg server trapping
              the keys used for the default VT switch  sequence,  which  means
              that clients can access them.  Default: off.

       Option "XkbDisable" "boolean"
              disable/enable  the  XKEYBOARD  extension.  The -kb command line
              option overrides this  config  file  option.   Default:  XKB  is
              enabled.

       Option "BlankTime"  "time"
              sets   the  inactivity  timeout  for  the  blank  phase  of  the
              screensaver.  time is in minutes.  This  is  equivalent  to  the
              Xorg  server’s -s flag, and the value can be changed at run-time
              with xset(1).  Default: 10 minutes.

       Option "StandbyTime"  "time"
              sets the inactivity timeout for the standby phase of DPMS  mode.
              time  is  in  minutes,  and the value can be changed at run-time
              with xset(1).  Default: 20 minutes.  This is only  suitable  for
              VESA  DPMS  compatible monitors, and may not be supported by all
              video drivers.  It is only enabled for  screens  that  have  the
              "DPMS" option set (see the MONITOR section below).

       Option "SuspendTime"  "time"
              sets  the inactivity timeout for the suspend phase of DPMS mode.
              time is in minutes, and the value can  be  changed  at  run-time
              with  xset(1).   Default: 30 minutes.  This is only suitable for
              VESA DPMS compatible monitors, and may not be supported  by  all
              video  drivers.   It  is  only enabled for screens that have the
              "DPMS" option set (see the MONITOR section below).

       Option "OffTime"  "time"
              sets the inactivity timeout for the  off  phase  of  DPMS  mode.
              time  is  in  minutes,  and the value can be changed at run-time
              with xset(1).  Default: 40 minutes.  This is only  suitable  for
              VESA  DPMS  compatible monitors, and may not be supported by all
              video drivers.  It is only enabled for  screens  that  have  the
              "DPMS" option set (see the MONITOR section below).

       Option "Pixmap"  "bpp"
              This sets the pixmap format to use for depth 24.  Allowed values
              for bpp are 24 and 32.  Default: 32  unless  driver  constraints
              don’t  allow  this  (which  is  rare).  Note: some clients don’t
              behave well when this value is set to 24.

       Option "PC98"  "boolean"
              Specify that the machine is  a  Japanese  PC-98  machine.   This
              should   not   be   enabled   for   anything   other   than  the
              Japanese-specific PC-98 architecture.  Default: auto-detected.

       Option "NoPM"  "boolean"
              Disables something to do with power management events.  Default:
              PM enabled on platforms that support it.

       Option "Xinerama"  "boolean"
              enable or disable XINERAMA extension.  Default is disabled.

       Option "AllowDeactivateGrabs" "boolean"
              This  option  enables  the use of the Ctrl+Alt+Keypad-Divide key
              sequence to deactivate any  active  keyboard  and  mouse  grabs.
              Default: off.

       Option "AllowClosedownGrabs" "boolean"
              This  option enables the use of the Ctrl+Alt+Keypad-Multiply key
              sequence to kill clients with an active keyboard or  mouse  grab
              as  well  as  killing  any  application that may have locked the
              server,  normally  using  the  XGrabServer(3)   Xlib   function.
              Default: off.
              Note     that     the     options    AllowDeactivateGrabs    and
              AllowClosedownGrabs will allow users to remove the grab used  by
              screen saver/locker programs.  An API was written to such cases.
              If you enable this option, make sure your screen saver/locker is
              updated.  Default: off.

       Option "HandleSpecialKeys" "when"
              This option controls when the server uses the builtin handler to
              process special key combinations (such  as  Ctrl+Alt+Backspace).
              Normally  the  XKEYBOARD extension keymaps will provide mappings
              for each of the special key combinations, so the builtin handler
              is  not  needed unless the XKEYBOARD extension is disabled.  The
              value of when can be Always, Never, or WhenNeeded.  Default: Use
              the  builtin  handler  only if needed.  The server will scan the
              keymap for a mapping to the Terminate action and, if found,  use
              XKEYBOARD  for processing actions, otherwise the builtin handler
              will be used.

       Option "AIGLX" "boolean"
              enable or disable AIGLX. AIGLX is enabled by default.

       Option "GlxVisuals" "string"
              This option controls how many GLX visuals the GLX  modules  sets
              up.  The default value is typical, which will setup up a typical
              subset of  the  GLXFBConfigs  provided  by  the  driver  as  GLX
              visuals.   Other  options  are  minimal,  which  will set up the
              minimal set allowed by the GLX specification and all which  will
              setup GLX visuals for all GLXFBConfigs.

       Option "UseDefaultFontPath" "boolean"
              Include  the default font path even if other paths are specified
              in xorg.conf. If enabled, other font paths are included as well.
              Enabled by default.

       Option "IgnoreABI" "boolean"
              Allow  modules  built  for a different, potentially incompatible
              version of the X server to load. Disabled by default.

       Option "AllowEmptyInput" "boolean"
              If enabled, don’t add the standard keyboard and  mouse  drivers,
              if  there  are  no input devices in the config file.  Enabled by
              default if  AutoAddDevices  and  AutoEnableDevices  is  enabled,
              otherwise disabled.

       Option "AutoAddDevices" "boolean"
              If  this  option is disabled, then no devices will be added from
              HAL events.  Enabled by default.

       Option "AutoEnableDevices" "boolean"
              If this option is disabled, then the devices will be added  (and
              the  DevicePresenceNotify  event  sent),  but  not enabled, thus
              leaving policy up to the client.  Enabled by default.

MODULE SECTION

       The Module section is used to specify which Xorg server modules  should
       be  loaded.   This  section is ignored when the Xorg server is built in
       static form.  The types of modules normally loaded in this section  are
       Xorg server extension modules, and font rasteriser modules.  Most other
       module types are loaded automatically when they are  needed  via  other
       mechanisms.   The Module section is optional, as are all of the entries
       that may be specified in it.

       Entries in this section may be  in  two  forms.   The  first  and  most
       commonly used form is an entry that uses the Load keyword, as described
       here:

       Load  "modulename"
              This instructs the server to load the module called  modulename.
              The  module name given should be the module’s standard name, not
              the module file name.  The standard name is case-sensitive,  and
              does  not  include the “lib” prefix, or the “.a”, “.o”, or “.so”
              suffixes.

              Example: the FreeType font rasteriser can  be  loaded  with  the
              following entry:

                  Load "freetype"

       Disable  "modulename"
              This  instructs  the  server  to  not  load  the  module  called
              modulename.  Some modules are loaded by default in  the  server,
              and  this overrides that default. If a Load instruction is given
              for the same module, it overrides the  Disable  instruction  and
              the  module  is  loaded.  The  module  name  given should be the
              module’s standard name, not the module file name.  As  with  the
              Load  instruction, the standard name is case-sensitive, and does
              not include the "lib"  prefix,  or  the  ".a",  ".o",  or  ".so"
              suffixes.

       The  second  form  of  entry  is a SubSection, with the subsection name
       being the module name, and the contents of the SubSection being Options
       that are passed to the module when it is loaded.

       Example:  the  extmod  module  (which contains a miscellaneous group of
       server extensions)  can  be  loaded,  with  the  XFree86-DGA  extension
       disabled by using the following entry:

           SubSection "extmod"
              Option  "omit XFree86-DGA"
           EndSubSection

       Modules  are searched for in each directory specified in the ModulePath
       search path, and in the drivers, input, extensions, fonts, and internal
       subdirectories  of  each  of  those  directories.  In addition to this,
       operating system specific subdirectories of all the above are  searched
       first if they exist.

       To  see  what  font  and  extension  modules  are  available, check the
       contents of the following directories:

           /usr/lib/modules/fonts
           /usr/lib/modules/extensions

       The “bitmap” font module is loaded automatically.   It  is  recommended
       that  at  very  least  the  “extmod” extension module be loaded.  If it
       isn’t, some commonly used server extensions (like the SHAPE  extension)
       will not be available.

INPUTDEVICE SECTION

       The  config  file  may  have multiple InputDevice sections.  There will
       normally be at least two: one for the core (primary) keyboard, and  one
       of  the  core  pointer.   If  either of these two is missing, a default
       configuration for the missing ones will be used.  Currently the default
       configuration may not work as expected on all platforms.

       InputDevice sections have the following format:

           Section "InputDevice"
               Identifier "name"
               Driver     "inputdriver"
               options
               ...
           EndSection

       The  Identifier  and  Driver  entries  are  required in all InputDevice
       sections.  All other entries are optional.

       The Identifier entry specifies the unique name for this  input  device.
       The Driver entry specifies the name of the driver to use for this input
       device.  When using  the  loadable  server,  the  input  driver  module
       "inputdriver"  will  be loaded for each active InputDevice section.  An
       InputDevice section is considered active if  it  is  referenced  by  an
       active  ServerLayout  section,  if it is referenced by the -keyboard or
       -pointer command line options, or if it is selected implicitly  as  the
       core  pointer  or  keyboard  device  in  the  absence  of such explicit
       references.  The most commonly used input drivers are  keyboard(4)  and
       mouse(4).

       In  the absence of an explicitly specified core input device, the first
       InputDevice marked as CorePointer (or CoreKeyboard) is used.  If  there
       is  no  match  there,  the  first InputDevice that uses the “mouse” (or
       “keyboard” or “kbd”) driver is used.  The  final  fallback  is  to  use
       built-in default configurations.

       InputDevice  sections  recognise some driver-independent Options, which
       are described here.  See the individual input driver manual pages for a
       description of the device-specific options.

       Option "CorePointer"
              When  this  is  set,  the  input device is installed as the core
              (primary) pointer  device.   There  must  be  exactly  one  core
              pointer.  If this option is not set here, or in the ServerLayout
              section, or from the -pointer  command  line  option,  then  the
              first  input  device  that  is  capable  of being used as a core
              pointer will be selected as the core pointer.   This  option  is
              implicitly set when the obsolete Pointer section is used.

       Option "CoreKeyboard"
              When  this  is  set,  the input device is to be installed as the
              core (primary) keyboard device.  There must be exactly one  core
              keyboard.   If  this option is not set here, in the ServerLayout
              section, or from the -keyboard command  line  option,  then  the
              first  input  device  that  is  capable  of being used as a core
              keyboard will be selected as the core keyboard.  This option  is
              implicitly set when the obsolete Keyboard section is used.

       Option "AlwaysCore"  "boolean"

       Option "SendCoreEvents"  "boolean"
              Both of these options are equivalent, and when enabled cause the
              input device to always report core events.  This  can  be  used,
              for  example,  to allow an additional pointer device to generate
              core pointer events (like moving the cursor, etc).

       Option "HistorySize"  "number"
           Sets the motion history size.  Default: 0.

       Option "SendDragEvents"  "boolean"
              ???

DEVICE SECTION

       The config file may have multiple Device sections.  There  must  be  at
       least one, for the video card being used.

       Device sections have the following format:

           Section "Device"
               Identifier "name"
               Driver     "driver"
               entries
               ...
           EndSection

       The  Identifier and Driver entries are required in all Device sections.
       All other entries are optional.

       The Identifier entry  specifies  the  unique  name  for  this  graphics
       device.   The  Driver entry specifies the name of the driver to use for
       this graphics device.  When  using  the  loadable  server,  the  driver
       module  "driver"  will  be  loaded  for  each active Device section.  A
       Device section is considered active if it is referenced  by  an  active
       Screen section.

       Device  sections recognise some driver-independent entries and Options,
       which  are  described  here.   Not  all  drivers  make  use  of   these
       driver-independent  entries,  and  many  of those that do don’t require
       them to be specified because the information is auto-detected.  See the
       individual  graphics  driver manual pages for further information about
       this, and for a description of the device-specific options.  Note  that
       most  of  the  Options  listed  here (but not the other entries) may be
       specified in the Screen section instead of here in the Device  section.

       BusID  "bus-id"
              This  specifies  the  bus  location  of  the graphics card.  For
              PCI/AGP   cards,   the    bus-id    string    has    the    form
              PCI:bus:device:function  (e.g., “PCI:1:0:0” might be appropriate
              for an AGP card).  This field is usually optional in single-head
              configurations  when using the primary graphics card.  In multi-
              head configurations, or when using a secondary graphics card  in
              a  single-head configuration, this entry is mandatory.  Its main
              purpose is to make an unambiguous connection between the  device
              section  and  the hardware it is representing.  This information
              can usually be found by running the pciaccess tool scanpci.

       Screen  number
              This option is mandatory for cards where a single PCI entity can
              drive  more  than  one  display  (i.e., multiple CRTCs sharing a
              single graphics  accelerator  and  video  memory).   One  Device
              section is required for each head, and this parameter determines
              which head each of the Device sections applies  to.   The  legal
              values  of number range from 0 to one less than the total number
              of heads per entity.  Most  drivers  require  that  the  primary
              screen (0) be present.

       Chipset  "chipset"
              This  usually  optional  entry specifies the chipset used on the
              graphics board.  In  most  cases  this  entry  is  not  required
              because  the  drivers  will  probe the hardware to determine the
              chipset type.   Don’t  specify  it  unless  the  driver-specific
              documentation recommends that you do.

       Ramdac  "ramdac-type"
              This  optional  entry  specifies  the type of RAMDAC used on the
              graphics board.  This is only used by a few of the drivers,  and
              in  most cases it is not required because the drivers will probe
              the hardware to determine the RAMDAC type where possible.  Don’t
              specify  it  unless the driver-specific documentation recommends
              that you do.

       DacSpeed  speed

       DacSpeed  speed-8 speed-16 speed-24 speed-32
              This optional entry specifies the RAMDAC speed rating (which  is
              usually printed on the RAMDAC chip).  The speed is in MHz.  When
              one value is given, it applies to all framebuffer  pixel  sizes.
              When  multiple  values  are given, they apply to the framebuffer
              pixel sizes 8, 16, 24 and 32 respectively.  This is not used  by
              many  drivers,  and  only  needs  to be specified when the speed
              rating of the RAMDAC is different from the defaults built in  to
              driver,  or  when  the  driver  can’t  auto-detect  the  correct
              defaults.   Don’t  specify   it   unless   the   driver-specific
              documentation recommends that you do.

       Clocks  clock ...
              specifies the pixel that are on your graphics board.  The clocks
              are in MHz, and may be specified as  a  floating  point  number.
              The value is stored internally to the nearest kHz.  The ordering
              of the clocks is important.  It must match the  order  in  which
              they  are selected on the graphics board.  Multiple Clocks lines
              may be specified, and each is concatenated  to  form  the  list.
              Most  drivers do not use this entry, and it is only required for
              some older boards with non-programmable clocks.   Don’t  specify
              this  entry  unless the driver-specific documentation explicitly
              recommends that you do.

       ClockChip  "clockchip-type"
              This optional entry is used to specify the clock  chip  type  on
              graphics boards which have a programmable clock generator.  Only
              a few  Xorg  drivers  support  programmable  clock  chips.   For
              details, see the appropriate driver manual page.

       VideoRam  mem
              This  optional  entry  specifies the amount of video ram that is
              installed on the graphics board.  This is  measured  in  kBytes.
              In  most  cases  this  is  not  required because the Xorg server
              probes the graphics  board  to  determine  this  quantity.   The
              driver-specific  documentation  should indicate when it might be
              needed.

       BiosBase  baseaddress
              This optional entry specifies the base address of the video BIOS
              for  the VGA board.  This address is normally auto-detected, and
              should only be specified if  the  driver-specific  documentation
              recommends it.

       MemBase  baseaddress
              This  optional  entry  specifies  the  memory  base address of a
              graphics board’s linear frame buffer.  This entry is not used by
              many  drivers,  and  it  should only be specified if the driver-
              specific documentation recommends it.

       IOBase  baseaddress
              This optional entry specifies the IO base address.   This  entry
              is  not used by many drivers, and it should only be specified if
              the driver-specific documentation recommends it.

       ChipID  id
              This optional entry specifies a numerical  ID  representing  the
              chip  type.   For  PCI cards, it is usually the device ID.  This
              can be used to override the auto-detection, but that should only
              be done when the driver-specific documentation recommends it.

       ChipRev  rev
              This  optional  entry  specifies the chip revision number.  This
              can be used to override the auto-detection, but that should only
              be done when the driver-specific documentation recommends it.

       TextClockFreq  freq
              This  optional entry specifies the pixel clock frequency that is
              used for the regular text mode.  The frequency is  specified  in
              MHz.  This is rarely used.

       Option "ModeDebug" "boolean"
              Enable   printing  of  additional  debugging  information  about
              modesetting to the server log.

       Options
              Option flags may be specified in  the  Device  sections.   These
              include  driver-specific options and driver-independent options.
              The former are described in the  driver-specific  documentation.
              Some  of the latter are described below in the section about the
              Screen section, and they may also be included here.

VIDEOADAPTOR SECTION

       Nobody wants to say how this works.  Maybe nobody knows ...

MONITOR SECTION

       The config file may  have  multiple  Monitor  sections.   There  should
       normally  be  at  least  one, for the monitor being used, but a default
       configuration will be created when one isn’t specified.

       Monitor sections have the following format:

           Section "Monitor"
               Identifier "name"
               entries
               ...
           EndSection

       The only mandatory entry in a Monitor section is the Identifier  entry.

       The  Identifier  entry specifies the unique name for this monitor.  The
       Monitor  section  may  be  used  to  provide  information   about   the
       specifications   of   the   monitor,   monitor-specific   Options,  and
       information about the video modes to use with the monitor.

       With RandR  1.2-enabled  drivers,  monitor  sections  may  be  tied  to
       specific  outputs  of  the  video  card.   Using the name of the output
       defined by the video driver plus the identifier of a  monitor  section,
       one  associates a monitor section with an output by adding an option to
       the Device section in the following format:

       Option "Monitor-outputname" "monitorsection"

       (for example, Option "Monitor-VGA" "VGA monitor" for a VGA output)

       In the absence of specific association of monitor sections to  outputs,
       if  a  monitor  section is present the server will associate it with an
       output   to   preserve   compatibility   for    previous    single-head
       configurations.

       Specifying  video modes is optional because the server will use the DDC
       or other information provided by the monitor to automatically configure
       the  list  of  modes available.  When modes are specified explicitly in
       the Monitor section (with the Modes, ModeLine, or  UseModes  keywords),
       built-in  modes  with  the same names are not included.  Built-in modes
       with different names are, however, still implicitly included, when they
       meet the requirements of the monitor.

       The entries that may be used in Monitor sections are described below.

       VendorName  "vendor"
              This optional entry specifies the monitor’s manufacturer.

       ModelName  "model"
              This optional entry specifies the monitor’s model.

       HorizSync  horizsync-range
              gives  the  range(s) of horizontal sync frequencies supported by
              the monitor.  horizsync-range may be a comma separated  list  of
              either  discrete  values or ranges of values.  A range of values
              is two values separated by a dash.  By default the values are in
              units  of  kHz.  They may be specified in MHz or Hz if MHz or Hz
              is added to the end of the line.  The data given here is used by
              the  Xorg  server  to  determine  if  video modes are within the
              specifications of  the  monitor.   This  information  should  be
              available  in the monitor’s handbook.  If this entry is omitted,
              a default range of 28-33kHz is used.

       VertRefresh  vertrefresh-range
              gives the range(s) of vertical refresh frequencies supported  by
              the monitor.  vertrefresh-range may be a comma separated list of
              either discrete values or ranges of values.  A range  of  values
              is two values separated by a dash.  By default the values are in
              units of Hz.  They may be specified in MHz or kHz if MHz or  kHz
              is added to the end of the line.  The data given here is used by
              the Xorg server to determine  if  video  modes  are  within  the
              specifications  of  the  monitor.   This  information  should be
              available in the monitor’s handbook.  If this entry is  omitted,
              a default range of 43-72Hz is used.

       DisplaySize  width height
              This  optional entry gives the width and height, in millimetres,
              of the picture area of the monitor.  If given this  is  used  to
              calculate the horizontal and vertical pitch (DPI) of the screen.

       Gamma  gamma-value

       Gamma  red-gamma green-gamma blue-gamma
              This is an optional entry that can be used to specify the  gamma
              correction  for  the  monitor.   It may be specified as either a
              single value or as three separate RGB values.  The values should
              be  in  the  range 0.1 to 10.0, and the default is 1.0.  Not all
              drivers are capable of using this information.

       UseModes  "modesection-id"
              Include the set of modes listed  in  the  Modes  section  called
              modesection-id.   This  makes  all  of the modes defined in that
              section available for use by this monitor.

       Mode  "name"
              This is an optional multi-line entry that can be used to provide
              definitions for video modes for the monitor.  In most cases this
              isn’t necessary because the built-in set of VESA standard  modes
              will  be  sufficient.  The Mode keyword indicates the start of a
              multi-line video mode  description.   The  mode  description  is
              terminated  with  the  EndMode  keyword.   The  mode description
              consists of the following entries:

              DotClock  clock
                  is the dot (pixel) clock rate to be used for the mode.

              HTimings  hdisp hsyncstart hsyncend htotal
                  specifies the horizontal timings for the mode.

              VTimings  vdisp vsyncstart vsyncend vtotal
                  specifies the vertical timings for the mode.

              Flags  "flag" ...
                  specifies an optional set of mode flags, each of which is  a
                  separate  string  in  double  quotes.  "Interlace" indicates
                  that the mode is interlaced.  "DoubleScan" indicates a  mode
                  where  each  scanline is doubled.  "+HSync" and "-HSync" can
                  be  used  to  select  the  polarity  of  the  HSync  signal.
                  "+VSync"  and "-VSync" can be used to select the polarity of
                  the VSync  signal.   "Composite"  can  be  used  to  specify
                  composite   sync   on  hardware  where  this  is  supported.
                  Additionally, on some hardware, "+CSync" and "-CSync" may be
                  used to select the composite sync polarity.

              HSkew  hskew
                  specifies  the  number  of pixels (towards the right edge of
                  the screen) by which the display  enable  signal  is  to  be
                  skewed.   Not all drivers use this information.  This option
                  might  become  necessary  to  override  the  default   value
                  supplied  by the server (if any).  “Roving” horizontal lines
                  indicate this value needs to be increased.  If the last  few
                  pixels on a scan line appear on the left of the screen, this
                  value should be decreased.

              VScan  vscan
                  specifies the number of times each scanline  is  painted  on
                  the  screen.   Not all drivers use this information.  Values
                  less than  1  are  treated  as  1,  which  is  the  default.
                  Generally,  the  "DoubleScan"  Flag  mentioned above doubles
                  this value.

       ModeLine  "name" mode-description
              This entry is a more compact version of the Mode entry,  and  it
              also  can  be used to specify video modes for the monitor.  is a
              single line format for specifying video modes.   In  most  cases
              this  isn’t  necessary because the built-in set of VESA standard
              modes will be sufficient.

              The mode-description is in four sections,  the  first  three  of
              which  are mandatory.  The first is the dot (pixel) clock.  This
              is a single number specifying the pixel clock rate for the  mode
              in MHz.  The second section is a list of four numbers specifying
              the  horizontal  timings.   These   numbers   are   the   hdisp,
              hsyncstart, hsyncend, and htotal values.  The third section is a
              list of four numbers specifying  the  vertical  timings.   These
              numbers  are the vdisp, vsyncstart, vsyncend, and vtotal values.
              The  final  section  is  a  list  of  flags   specifying   other
              characteristics  of the mode.  Interlace indicates that the mode
              is interlaced.  DoubleScan indicates a mode where each  scanline
              is  doubled.   +HSync  and  -HSync  can  be  used  to select the
              polarity of the HSync signal.  +VSync and -VSync can be used  to
              select  the polarity of the VSync signal.  Composite can be used
              to specify composite sync on hardware where this  is  supported.
              Additionally, on some hardware, +CSync and -CSync may be used to
              select the composite sync polarity.  The HSkew and VScan options
              mentioned  above in the Modes entry description can also be used
              here.

       Option "DPMS"  "bool"
              This option controls whether the server should enable  the  DPMS
              extension  for power management for this screen.  The default is
              to enable the extension.

       Option "SyncOnGreen"  "bool"
              This option controls whether the video  card  should  drive  the
              sync  signal on the green color pin.  Not all cards support this
              option, and most monitors do not require  it.   The  default  is
              off.

       Option "TargetRefresh"  "rate"
              This optional entry specifies the vertical refresh rate that the
              server should aim for when selecting video modes.  Without  this
              option,  the  default  is  to  prefer  modes with higher refresh
              rates.

       Option "PreferredMode"  "string"
              This optional entry  specifies  a  mode  to  be  marked  as  the
              preferred  initial  mode  of the monitor.  (RandR 1.2-supporting
              drivers only)

       Option "Position"  "x y"
              This optional entry specifies the position of the monitor within
              the X screen.  (RandR 1.2-supporting drivers only)

       Option "LeftOf"  "output"
              This  optional  entry  specifies  that  the  monitor  should  be
              positioned to the left of the output (not monitor) of the  given
              name.  (RandR 1.2-supporting drivers only)

       Option "RightOf"  "output"
              This  optional  entry  specifies  that  the  monitor  should  be
              positioned to the right of the output (not monitor) of the given
              name.  (RandR 1.2-supporting drivers only)

       Option "Above"  "output"
              This  optional  entry  specifies  that  the  monitor  should  be
              positioned above the output (not monitor)  of  the  given  name.
              (RandR 1.2-supporting drivers only)

       Option "Below"  "output"
              This  optional  entry  specifies  that  the  monitor  should  be
              positioned below the output (not monitor)  of  the  given  name.
              (RandR 1.2-supporting drivers only)

       Option "Enable"  "bool"
              This  optional  entry  specifies  whether  the monitor should be
              turned on at startup.  By default, the server  will  attempt  to
              enable  all  connected  monitors.  (RandR 1.2-supporting drivers
              only)

       Option "MinClock"  "frequency"
              This optional entry specifies the minimum  dot  clock,  in  kHz,
              that is supported by the monitor.

       Option "MaxClock"  "frequency"
              This  optional  entry  specifies  the maximum dot clock, in kHz,
              that is supported by the monitor.

       Option "Ignore"  "bool"
              This optional entry specifies that the monitor should be ignored
              entirely, and not reported through RandR.  This is useful if the
              hardware reports the  presence  of  outputs  that  don’t  exist.
              (RandR 1.2-supporting drivers only)

       Option "Rotate"  "rotation"
              This  optional entry specifies the initial rotation of the given
              monitor.   Valid  values  for  rotation  are  "normal",  "left",
              "right", and "inverted".  (RandR 1.2-supporting drivers only)

MODES SECTION

       The  config  file  may  have  multiple  Modes sections, or none.  These
       sections provide a way of defining sets of video modes independently of
       the  Monitor  sections.   Monitor  sections may include the definitions
       provided in these sections by using  the  UseModes  keyword.   In  most
       cases  the Modes sections are not necessary because the built-in set of
       VESA standard modes will be sufficient.

       Modes sections have the following format:

           Section "Modes"
               Identifier "name"
               entries
               ...
           EndSection

       The Identifier entry specifies the unique name for  this  set  of  mode
       descriptions.   The  other  entries permitted in Modes sections are the
       Mode and ModeLine entries that  are  described  above  in  the  Monitor
       section.

SCREEN SECTION

       The  config  file  may have multiple Screen sections.  There must be at
       least one, for the “screen” being  used.   A  “screen”  represents  the
       binding  of  a  graphics device (Device section) and a monitor (Monitor
       section).  A Screen section is considered “active” if it is  referenced
       by  an  active  ServerLayout  section  or  by  the -screen command line
       option.  If neither of those is present, the first Screen section found
       in the config file is considered the active one.

       Screen sections have the following format:

           Section "Screen"
               Identifier "name"
               Device     "devid"
               Monitor    "monid"
               entries
               ...
               SubSection "Display"
                  entries
                  ...
               EndSubSection
               ...
           EndSection

       The  Identifier  and  Device  entries  are  mandatory.   All others are
       optional.

       The Identifier entry specifies the unique name for  this  screen.   The
       Screen  section  provides  information  specific  to  the whole screen,
       including screen-specific Options.  In multi-head configurations, there
       will  be  multiple  active  Screen  sections,  one  for each head.  The
       entries available for this section are:

       Device  "device-id"
              This mandatory entry specifies the Device section to be used for
              this  screen.   This  is what ties a specific graphics card to a
              screen.  The device-id must match the  Identifier  of  a  Device
              section in the config file.

       Monitor  "monitor-id"
              specifies  which  monitor  description  is  to  be used for this
              screen.   If  a  Monitor  name  is  not  specified,  a   default
              configuration  is used.  Currently the default configuration may
              not function as expected on all platforms.

       VideoAdaptor  "xv-id"
              specifies an optional Xv video adaptor description  to  be  used
              with this screen.

       DefaultDepth  depth
              specifies  which  color  depth the server should use by default.
              The -depth command line option can be used to override this.  If
              neither  is specified, the default depth is driver-specific, but
              in most cases is 8.

       DefaultFbBpp  bpp
              specifies which framebuffer  layout  to  use  by  default.   The
              -fbbpp  command  line  option  can be used to override this.  In
              most cases the driver will chose  the  best  default  value  for
              this.   The only case where there is even a choice in this value
              is for depth 24, where some hardware supports both a  packed  24
              bit framebuffer layout and a sparse 32 bit framebuffer layout.

       Options
              Various  Option  flags  may  be specified in the Screen section.
              Some  are  driver-specific  and  are  described  in  the  driver
              documentation.    Others   are   driver-independent,   and  will
              eventually be described here.

       Option "Accel"
              Enables XAA (X  Acceleration  Architecture),  a  mechanism  that
              makes  video  cards’  2D  hardware acceleration available to the
              __xservername__ server.  This option is on by  default,  but  it
              may be necessary to turn it off if there are bugs in the driver.
              There  are  many  options  to   disable   specific   accelerated
              operations, listed below.  Note that disabling an operation will
              have no effect if the operation is not accelerated (whether  due
              to lack of support in the hardware or in the driver).

       Option "InitPrimary" "boolean"
              Use  the  Int10  module to initialize the primary graphics card.
              Normally, only secondary cards are soft-booted using  the  Int10
              module,  as the primary card has already been initialized by the
              BIOS at boot time.  Default: false.

       Option "NoInt10" "boolean"
              Disables the Int10 module, a module that uses the int10 call  to
              the BIOS of the graphics card to initialize it.  Default: false.

       Option "NoMTRR"
              Disables MTRR (Memory Type Range Register) support, a feature of
              modern  processors  which  can  improve  video  performance by a
              factor of up to 2.5.  Some hardware has buggy MTRR support,  and
              some  video  drivers  have  been  known to exhibit problems when
              MTRR’s are used.

       Option "XaaNoCPUToScreenColorExpandFill"
              Disables accelerated rectangular  expansion  blits  from  source
              patterns   stored   in  system  memory  (using  a  memory-mapped
              aperture).

       Option "XaaNoColor8x8PatternFillRect"
              Disables accelerated  fills  of  a  rectangular  region  with  a
              full-color pattern.

       Option "XaaNoColor8x8PatternFillTrap"
              Disables  accelerated  fills  of  a  trapezoidal  region  with a
              full-color pattern.

       Option "XaaNoDashedBresenhamLine"
              Disables accelerated dashed Bresenham line draws.

       Option "XaaNoDashedTwoPointLine"
              Disables accelerated dashed line  draws  between  two  arbitrary
              points.

       Option "XaaNoImageWriteRect"
              Disables   accelerated   transfers   of  full-color  rectangular
              patterns  from  system  memory  to   video   memory   (using   a
              memory-mapped aperture).

       Option "XaaNoMono8x8PatternFillRect"
              Disables  accelerated  fills  of  a  rectangular  region  with a
              monochrome pattern.

       Option "XaaNoMono8x8PatternFillTrap"
              Disables accelerated  fills  of  a  trapezoidal  region  with  a
              monochrome pattern.

       Option "XaaNoOffscreenPixmaps"
              Disables  accelerated  draws  into  pixmaps  stored in offscreen
              video memory.

       Option "XaaNoPixmapCache"
              Disables caching of patterns in offscreen video memory.

       Option "XaaNoScanlineCPUToScreenColorExpandFill"
              Disables accelerated rectangular  expansion  blits  from  source
              patterns stored in system memory (one scan line at a time).

       Option "XaaNoScanlineImageWriteRect"
              Disables   accelerated   transfers   of  full-color  rectangular
              patterns from system memory to video memory (one scan line at  a
              time).

       Option "XaaNoScreenToScreenColorExpandFill"
              Disables  accelerated  rectangular  expansion  blits from source
              patterns stored in offscreen video memory.

       Option "XaaNoScreenToScreenCopy"
              Disables accelerated copies of rectangular regions from one part
              of video memory to another part of video memory.

       Option "XaaNoSolidBresenhamLine"
              Disables accelerated solid Bresenham line draws.

       Option "XaaNoSolidFillRect"
              Disables accelerated solid-color fills of rectangles.

       Option "XaaNoSolidFillTrap"
              Disables  accelerated solid-color fills of Bresenham trapezoids.

       Option "XaaNoSolidHorVertLine"
              Disables accelerated solid horizontal and vertical line draws.

       Option "XaaNoSolidTwoPointLine"
              Disables accelerated solid  line  draws  between  two  arbitrary
              points.

       Each  Screen  section  may  optionally  contain  one  or  more  Display
       subsections.    Those   subsections   provide   depth/fbbpp    specific
       configuration  information,  and  the  one  chosen depends on the depth
       and/or fbbpp that is being used for the screen.  The Display subsection
       format is described in the section below.

DISPLAY SUBSECTION

       Each  Screen  section  may  have  multiple  Display  subsections.   The
       “active” Display subsection is the first that matches the depth  and/or
       fbbpp  values being used, or failing that, the first that has neither a
       depth or fbbpp value specified.  The Display subsections are  optional.
       When  there  isn’t one that matches the depth and/or fbbpp values being
       used, all the parameters that can be specified here fall back to  their
       defaults.

       Display subsections have the following format:

               SubSection "Display"
                   Depth  depth
                   entries
                   ...
               EndSubSection

       Depth  depth
              This entry specifies what colour depth the Display subsection is
              to be used for.  This entry is usually specified, but it may  be
              omitted to create a match-all Display subsection or when wishing
              to match only against the FbBpp parameter.  The range  of  depth
              values  that  are  allowed  depends on the driver.  Most drivers
              support 8, 15, 16 and 24.  Some also support  1  and/or  4,  and
              some  may support other values (like 30).  Note: depth means the
              number of bits in a pixel that are actually  used  to  determine
              the pixel colour.  32 is not a valid depth value.  Most hardware
              that uses 32 bits per pixel only uses 24 of  them  to  hold  the
              colour information, which means that the colour depth is 24, not
              32.

       FbBpp  bpp
              This  entry  specifies  the  framebuffer  format  this   Display
              subsection  is  to  be used for.  This entry is only needed when
              providing depth 24 configurations that allow a choice between  a
              24  bpp packed framebuffer format and a 32bpp sparse framebuffer
              format.  In most cases this entry should not be used.

       Weight  red-weight green-weight blue-weight
              This optional entry specifies the relative RGB weighting  to  be
              used  for  a  screen  is being used at depth 16 for drivers that
              allow multiple formats.  This may also  be  specified  from  the
              command line with the -weight option (see Xorg(1)).

       Virtual  xdim ydim
              This  optional  entry specifies the virtual screen resolution to
              be used.  xdim must be a multiple of either 8  or  16  for  most
              drivers,  and  a multiple of 32 when running in monochrome mode.
              The given value will be rounded down if this is  not  the  case.
              Video  modes  which are too large for the specified virtual size
              will be rejected.  If this entry is  not  present,  the  virtual
              screen resolution will be set to accommodate all the valid video
              modes  given  in  the  Modes   entry.    Some   drivers/hardware
              combinations  do  not  support  virtual  screens.   Refer to the
              appropriate driver-specific documentation for details.

       ViewPort  x0 y0
              This optional entry sets the upper left corner  of  the  initial
              display.    This  is  only  relevant  when  the  virtual  screen
              resolution is different from the resolution of the initial video
              mode.  If this entry is not given, then the initial display will
              be centered in the virtual display area.

       Modes  "mode-name" ...
              This optional entry specifies the list of video  modes  to  use.
              Each  mode-name  specified  must be in double quotes.  They must
              correspond to those specified or referenced in  the  appropriate
              Monitor  section  (including implicitly referenced built-in VESA
              standard modes).  The server will delete modes  from  this  list
              which  don’t satisfy various requirements.  The first valid mode
              in this list will be the default display mode for startup.   The
              list  of  valid  modes  is  converted internally into a circular
              list.   It  is  possible  to  switch  to  the  next  mode   with
              Ctrl+Alt+Keypad-Plus    and    to   the   previous   mode   with
              Ctrl+Alt+Keypad-Minus.  When this entry is  omitted,  the  valid
              modes  referenced  by  the  appropriate  Monitor section will be
              used.  If the  Monitor  section  contains  no  modes,  then  the
              selection will be taken from the built-in VESA standard modes.

       Visual  "visual-name"
              This optional entry sets the default root visual type.  This may
              also be specified from the command line (see the Xserver(1)  man
              page).   The  visual types available for depth 8 are (default is
              PseudoColor):

                  StaticGray
                  GrayScale
                  StaticColor
                  PseudoColor
                  TrueColor
                  DirectColor

              The visual type available for the  depths  15,  16  and  24  are
              (default is TrueColor):

                  TrueColor
                  DirectColor

              Not all drivers support DirectColor at these depths.

              The  visual  types  available  for  the  depth 4 are (default is
              StaticColor):

                  StaticGray
                  GrayScale
                  StaticColor
                  PseudoColor

              The visual type  available  for  the  depth  1  (monochrome)  is
              StaticGray.

       Black  red green blue
              This  optional  entry allows the “black” colour to be specified.
              This is only supported at depth 1.  The default is black.

       White  red green blue
              This optional entry allows the “white” colour to  be  specified.
              This is only supported at depth 1.  The default is white.

       Options
              Option flags may be specified in the Display subsections.  These
              may  include  driver-specific  options  and   driver-independent
              options.   The  former  are  described  in  the  driver-specific
              documentation.  Some of the latter are described  above  in  the
              section  about the Screen section, and they may also be included
              here.

SERVERLAYOUT SECTION

       The config file may have multiple  ServerLayout  sections.   A  “server
       layout” represents the binding of one or more screens (Screen sections)
       and one or more input devices (InputDevice sections) to form a complete
       configuration.   In  multi-head  configurations,  it also specifies the
       relative layout of the heads.  A  ServerLayout  section  is  considered
       “active”  if  it is referenced by the -layout command line option or by
       an Option "DefaultServerLayout" entry in the ServerFlags  section  (the
       former  takes  precedence  over  the latter).  If those options are not
       used, the first ServerLayout  section  found  in  the  config  file  is
       considered  the  active  one.  If no ServerLayout sections are present,
       the single active screen  and  two  active  (core)  input  devices  are
       selected as described in the relevant sections above.

       ServerLayout sections have the following format:

           Section "ServerLayout"
               Identifier   "name"
               Screen       "screen-id"
               ...
               InputDevice  "idev-id"
               ...
               options
               ...
           EndSection

       Each  ServerLayout  section  must have an Identifier entry and at least
       one Screen entry.

       The Identifier entry specifies the unique name for this server  layout.
       The  ServerLayout  section  provides  information specific to the whole
       session, including session-specific Options.  The  ServerFlags  options
       (described  above)  may be specified here, and ones given here override
       those given in the ServerFlags section.

       The entries that may be used in this section are described here.

       Screen  screen-num "screen-id" position-information
              One of these entries must be given for each screen being used in
              a  session.  The screen-id field is mandatory, and specifies the
              Screen  section  being  referenced.   The  screen-num  field  is
              optional,  and  may  be  used  to  specify  the screen number in
              multi-head configurations.  When  this  field  is  omitted,  the
              screens  will  be numbered in the order that they are listed in.
              The numbering starts from  0,  and  must  be  consecutive.   The
              position-information  field  describes  the way multiple screens
              are positioned.  There are a number of different ways that  this
              information can be provided:

              x y

              Absolute  x y
                  These  both specify that the upper left corner’s coordinates
                  are (x,y).  The Absolute keyword is  optional.   Some  older
                  versions  of  XFree86  (4.2 and earlier) don’t recognise the
                  Absolute  keyword,  so  it’s  safest  to  just  specify  the
                  coordinates without it.

              RightOf   "screen-id"

              LeftOf    "screen-id"

              Above     "screen-id"

              Below     "screen-id"

              Relative  "screen-id" x y
                  These give the screen’s location relative to another screen.
                  The first four position the screen immediately to the right,
                  left,  above or below the other screen.  When positioning to
                  the  right  or  left,  the  top  edges  are  aligned.   When
                  positioning above or below, the left edges are aligned.  The
                  Relative form specifies the offset of  the  screen’s  origin
                  (upper  left  corner)  relative  to  the  origin  of another
                  screen.

       InputDevice  "idev-id" "option" ...
              One of these entries should be given for each input device being
              used in a session.  Normally at least two are required, one each
              for the core pointer and keyboard devices.  If either  of  those
              is  missing, suitable InputDevice entries are searched for using
              the method described above  in  the  INPUTDEVICE  section.   The
              idev-id  field  is  mandatory,  and  specifies  the  name of the
              InputDevice section being referenced.   Multiple  option  fields
              may  be specified, each in double quotes.  The options permitted
              here are any that may also be given in the InputDevice sections.
              Normally  only  session-specific  input  device options would be
              used here.  The most commonly used options are:

                  "CorePointer"
                  "CoreKeyboard"
                  "SendCoreEvents"

              and the first two should normally be used to indicate  the  core
              pointer and core keyboard devices respectively.

       Options
              In  addition  to  the  following,  any  option  permitted in the
              ServerFlags section may also be specified here.  When  the  same
              option  appears  in  both places, the value given here overrides
              the one given in the ServerFlags section.

       Option "IsolateDevice"  "bus-id"
              Restrict device resets to the specified bus-id.  See  the  BusID
              option  (described  in  DEVICE SECTION, above) for the format of
              the bus-id parameter.   This  option  overrides  SingleCard,  if
              specified.  At present, only PCI devices can be isolated in this
              manner.

       Option "SingleCard"  "boolean"
              As IsolateDevice, except that the bus ID of the first device  in
              the layout is used.

       Here  is  an  example  of  a  ServerLayout  section  for  a dual headed
       configuration with two mice:

           Section "ServerLayout"
               Identifier  "Layout 1"
               Screen      "MGA 1"
               Screen      "MGA 2" RightOf "MGA 1"
               InputDevice "Keyboard 1" "CoreKeyboard"
               InputDevice "Mouse 1"    "CorePointer"
               InputDevice "Mouse 2"    "SendCoreEvents"
               Option      "BlankTime"  "5"
           EndSection

DRI SECTION

       This optional section is used  to  provide  some  information  for  the
       Direct  Rendering  Infrastructure.   Details  about  the format of this
       section can  be  found  in  the  README.DRI  document,  which  is  also
       available on-line at <http://dri.freedesktop.org/>.

VENDOR SECTION

       The  optional  Vendor  section  may  be used to provide vendor-specific
       configuration information.  Multiple Vendor sections  may  be  present,
       and  they  may  contain  an Identifier entry and multiple Option flags.
       The data therein is not used in this release.

SEE ALSO

       General: X(7), Xserver(1), Xorg(1), cvt(1), gtf(1).

       Not all modules or interfaces are available on all platforms.

       Display  drivers:  apm(4),  chips(4),  cirrus(4),  cyrix(4),  fbdev(4),
       glide(4),   glint(4),  i128(4),  i740(4),  i810(4),  imstt(4),  mga(4),
       neomagic(4),  nv(4),  r128(4),  rendition(4),  savage(4),   s3virge(4),
       siliconmotion(4),  sis(4), sunbw2(4), suncg14(4), suncg3(4), suncg6(4),
       sunffb(4), sunleo(4), suntcx(4), tdfx(4), tga(4), trident(4), tseng(4),
       vesa(4), vga(4), via(4), vmware(4).

       Input  drivers: citron(4), dmc(4), dynapro(4), elographics(4), fpit(4),
       js_x(4),  kbd(4),  keyboard(4),  microtouch(4),  mouse(4),  mutouch(4),
       palmax(4), penmount(4), tek4957(4), void(4), wacom(4).

       Other modules and interfaces: fbdevhw(4), v4l(4).

AUTHORS

       This    manual    page   was   largely   rewritten   by   David   Dawes
       <dawes@xfree86.org>.