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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  may be either absolute directory
              paths, or a font server  identifier.   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:

                  /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/Speedo/
                  /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.

       RGBPath "path"
              sets  the path name for the RGB color database.  When this entry
              is not specified in the config file, the server  falls  back  to
              the compiled-in default RGB path, which is:

                  /usr/share/X11/rgb

       Note  that  an  implicit  .txt  is added to this path if the server was
       compiled to use text rather than binary format RGB color databases.

       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 Xorg-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 "VTInit"  "command"
              Runs  command  after  the VT used by the server has been opened.
              The command string is passed to "/bin/sh -c", and  is  run  with
              the  real  user’s  id  with stdin and stdout set to the VT.  The
              purpose  of  this  option  is  to  allow  system  dependent   VT
              initialisation commands to be run.  This option should rarely be
              needed.  Default: not set.

       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 "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.

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  Xorg  server  with  the
              -scanpci command line option.

       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"  "monitor"
              This  optional  entry  specifies  that  the  monitor  should  be
              positioned to the left of the monitor of the given name.  (RandR
              1.2-supporting drivers only)

       Option "RightOf"  "monitor"
              This  optional  entry  specifies  that  the  monitor  should  be
              positioned  to  the  right  of  the  monitor  of the given name.
              (RandR 1.2-supporting drivers only)

       Option "Above"  "monitor"
              This  optional  entry  specifies  that  the  monitor  should  be
              positioned   above  the  monitor  of  the  given  name.   (RandR
              1.2-supporting drivers only)

       Option "Below"  "monitor"
              This  optional  entry  specifies  that  the  monitor  should  be
              positioned   below  the  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 Xorg  (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).

       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>.