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NAME

       Xorg - X11R7 X server

SYNOPSIS

       Xorg [:display] [option ...]

DESCRIPTION

       Xorg  is a full featured X server that was originally designed for UNIX
       and UNIX-like operating systems running on Intel x86 hardware.  It  now
       runs on a wider range of hardware and OS platforms.

       This  work  was  derived  by  the  X.Org  Foundation  from  the XFree86
       Project's XFree86 4.4rc2 release.  The XFree86 release  was  originally
       derived from X386 1.2 by Thomas Roell which was contributed to X11R5 by
       Snitily Graphics Consulting Service.

PLATFORMS

       Xorg operates under a wide range  of  operating  systems  and  hardware
       platforms.   The  Intel  x86  (IA32)  architecture  is  the most widely
       supported hardware platform.  Other hardware platforms  include  Compaq
       Alpha, Intel IA64, AMD64, SPARC and PowerPC.  The most widely supported
       operating systems are the free/OpenSource  UNIX-like  systems  such  as
       Linux,   FreeBSD,   NetBSD,  OpenBSD,  and  Solaris.   Commercial  UNIX
       operating systems such as UnixWare are also supported.  Other supported
       operating  systems  include  GNU  Hurd.  Mac OS X is supported with the
       Xquartz(1) X server.  Win32/Cygwin is  supported  with  the  XWin(1)  X
       server.

NETWORK CONNECTIONS

       Xorg  supports  connections  made  using  the  following reliable byte-
       streams:

       Local
           On most platforms, the "Local" connection  type  is  a  UNIX-domain
           socket.   On  some System V platforms, the "local" connection types
           also include STREAMS pipes, named pipes, and some other mechanisms.

       TCPIP
           Xorg listens on port 6000+n, where n is the display  number.   This
           connection  type can be disabled with the -nolisten option (see the
           Xserver(1) man page for details).

ENVIRONMENT VARIABLES

       For operating systems that support local connections  other  than  Unix
       Domain  sockets (SVR3 and SVR4), there is a compiled-in list specifying
       the order in which local connections should be  attempted.   This  list
       can  be  overridden by the XLOCAL environment variable described below.
       If the display name indicates a best-choice connection should  be  made
       (e.g.   :0.0),  each  connection  mechanism is tried until a connection
       succeeds or no more mechanisms are available.  Note: for these OSs, the
       Unix  Domain  socket  connection  is treated differently from the other
       local connection types.  To use it  the  connection  must  be  made  to
       unix:0.0.

       The  XLOCAL environment variable should contain a list of one more more
       of the following:

               NAMED
               PTS
               SCO
               ISC

       which represent SVR4 Named Streams pipe, Old-style  USL  Streams  pipe,
       SCO  XSight  Streams pipe, and ISC Streams pipe, respectively.  You can
       select a single mechanism (e.g.   XLOCAL=NAMED),  or  an  ordered  list
       (e.g.  XLOCAL="NAMED:PTS:SCO").  his variable overrides the compiled-in
       defaults.   For  SVR4  it  is  recommended  that  NAMED  be  the  first
       preference connection.  The default setting is PTS:NAMED:ISC:SCO.

       To  globally  override the compiled-in defaults, you should define (and
       export if using sh or ksh) XLOCAL globally.  If you  use  startx(1)  or
       xinit(1),  the  definition  should be at the top of your .xinitrc file.
       If  you  use  xdm(1),  the  definitions  should  be  early  on  in  the
       /usr/lib/X11/xdm/Xsession script.

OPTIONS

       Xorg  supports several mechanisms for supplying/obtaining configuration
       and run-time parameters: command line options,  environment  variables,
       the  xorg.conf(5)  configuration  files,  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
       here  and  in  the  Xserver(1)  manual  page.   Most configuration file
       parameters, with their defaults,  are  described  in  the  xorg.conf(5)
       manual  page.   Driver and module specific configuration parameters are
       described in the relevant driver or module manual page.

       In addition to the normal server options described  in  the  Xserver(1)
       manual page, Xorg accepts the following command line switches:

       vtXX    XX specifies the Virtual Terminal device number which Xorg will
               use.  Without this option, Xorg will pick the  first  available
               Virtual  Terminal that it can locate.  This option applies only
               to platforms that have virtual terminal support, such as Linux,
               BSD, OpenSolaris, SVR3, and SVR4.

       -allowMouseOpenFail
               Allow  the server to start up even if the mouse device can't be
               opened   or   initialised.    This   is   equivalent   to   the
               AllowMouseOpenFail xorg.conf(5) file option.

       -allowNonLocalXvidtune
               Make  the  VidMode extension available to remote clients.  This
               allows the xvidtune client to connect from another host.   This
               is  equivalent  to  the AllowNonLocalXvidtune xorg.conf(5) file
               option.  By default non-local connections are not allowed.

       -bgamma value
               Set the blue gamma correction.  value must be between  0.1  and
               10.   The  default  is 1.0.  Not all drivers support this.  See
               also the -gamma, -rgamma, and -ggamma options.

       -bpp n  No longer supported.  Use -depth to set the  color  depth,  and
               use   -fbbpp   if  you  really  need  to  force  a  non-default
               framebuffer (hardware) pixel format.

       -config file
               Read the server configuration from file.  This option will work
               for any file when the server is run as root (i.e, with real-uid
               0), or for files relative to a directory in the  config  search
               path for all other users.

       -configdir directory
               Read  the  server  configuration  files  from  directory.  This
               option will work for any directory when the server  is  run  as
               root  (i.e,  with real-uid 0), or for directories relative to a
               directory in the config directory search  path  for  all  other
               users.

       -configure
               When  this option is specified, the Xorg server loads all video
               driver modules, probes for available hardware, and  writes  out
               an  initial xorg.conf(5) file based on what was detected.  This
               option currently has some problems on some  platforms,  but  in
               most  cases  it  is  a  good way to bootstrap the configuration
               process.  This option is only available when the server is  run
               as root (i.e, with real-uid 0).

       -crt /dev/ttyXX
               SCO  only.   This is the same as the vt option, and is provided
               for compatibility with the native SCO X server.

       -depth n
               Sets the default color depth.  Legal values are 1,  4,  8,  15,
               16, and 24.  Not all drivers support all values.

       -disableVidMode
               Disable  the  parts  of  the  VidMode  extension  (used  by the
               xvidtune client) that can be used to change  the  video  modes.
               This  is equivalent to the DisableVidModeExtension xorg.conf(5)
               file option.

       -fbbpp n
               Sets the number of framebuffer bits per pixel.  You should only
               set this if you're sure it's necessary; normally the server can
               deduce the correct value from -depth above.  Useful if you want
               to  run  a  depth  24  configuration  with a 24 bpp framebuffer
               rather than the (possibly default) 32 bpp framebuffer (or  vice
               versa).   Legal  values  are 1, 8, 16, 24, 32.  Not all drivers
               support all values.

       -flipPixels
               Swap the default values for the black and white pixels.

       -gamma value
               Set the gamma correction.  value must be between  0.1  and  10.
               The  default is 1.0.  This value is applied equally to the R, G
               and B values.  Those values can be set independently  with  the
               -rgamma, -bgamma, and -ggamma options.  Not all drivers support
               this.

       -ggamma value
               Set the green gamma correction.  value must be between 0.1  and
               10.   The  default  is 1.0.  Not all drivers support this.  See
               also the -gamma, -rgamma, and -bgamma options.

       -ignoreABI
               The Xorg server checks the ABI revision levels of  each  module
               that  it  loads.   It will normally refuse to load modules with
               ABI revisions that  are  newer  than  the  server's.   This  is
               because  such modules might use interfaces that the server does
               not have.  When this option is specified, mismatches like  this
               are  downgraded  from  fatal  errors  to warnings.  This option
               should be used with care.

       -isolateDevice bus-id
               Restrict device resets to the device  at  bus-id.   The  bus-id
               string   has   the   form   bustype:bus:device:function  (e.g.,
               'PCI:1:0:0').  At present, only isolation  of  PCI  devices  is
               supported;  i.e., this option is ignored if bustype is anything
               other than 'PCI'.

       -keeptty
               Prevent the  server  from  detaching  its  initial  controlling
               terminal.   This  option  is  only  useful  when  debugging the
               server.  Not all platforms support (or can use) this option.

       -keyboard keyboard-name
               Use the xorg.conf(5) file InputDevice section called  keyboard-
               name  as  the  core  keyboard.  This option is ignored when the
               Layout section specifies a core keyboard.  In  the  absence  of
               both  a  Layout  section  and  this  option, the first relevant
               InputDevice section is used for the core keyboard.

       -layout layout-name
               Use the xorg.conf(5) file Layout  section  called  layout-name.
               By default the first Layout section is used.

       -logfile filename
               Use  the file called filename as the Xorg server log file.  The
               default log file  is  /var/log/Xorg.n.log  on  most  platforms,
               where  n is the display number of the Xorg server.  The default
               may be in a different directory on some platforms.  This option
               is  only  available  when  the server is run as root (i.e, with
               real-uid 0).

       -logverbose [n]
               Sets the verbosity level for information printed  to  the  Xorg
               server   log  file.   If  the  n  value  isn't  supplied,  each
               occurrence of this option increments  the  log  file  verbosity
               level.   When  the  n value is supplied, the log file verbosity
               level is set to that value.  The  default  log  file  verbosity
               level is 3.

       -modulepath searchpath
               Set  the  module  search  path  to searchpath.  searchpath is a
               comma separated list of directories to search for  Xorg  server
               modules.   This option is only available when the server is run
               as root (i.e, with real-uid 0).

       -nosilk Disable Silken Mouse support.

       -pixmap24
               Set the internal pixmap format for depth 24 pixmaps to 24  bits
               per pixel.  The default is usually 32 bits per pixel.  There is
               normally  little  reason  to  use  this  option.   Some  client
               applications don't like this pixmap format, even though it is a
               perfectly legal format.   This  is  equivalent  to  the  Pixmap
               xorg.conf(5) file option.

       -pixmap32
               Set  the internal pixmap format for depth 24 pixmaps to 32 bits
               per pixel.  This is usually the default.  This is equivalent to
               the Pixmap xorg.conf(5) file option.

       -pointer pointer-name
               Use  the  xorg.conf(5) file InputDevice section called pointer-
               name as the core pointer.  This  option  is  ignored  when  the
               Layout  section  specifies  a  core pointer.  In the absence of
               both a Layout section  and  this  option,  the  first  relevant
               InputDevice section is used for the core pointer.

       -quiet  Suppress most informational messages at startup.  The verbosity
               level is set to zero.

       -rgamma value
               Set the red gamma correction.  value must be  between  0.1  and
               10.   The  default  is 1.0.  Not all drivers support this.  See
               also the -gamma, -bgamma, and -ggamma options.

       -screen screen-name
               Use the xorg.conf(5) file Screen  section  called  screen-name.
               By default the screens referenced by the default Layout section
               are used, or the first Screen section when there are no  Layout
               sections.

       -showconfig
               This  is  the  same as the -version option, and is included for
               compatibility reasons.  It may be removed in a future  release,
               so the -version option should be used instead.

       -showDefaultModulePath
               Print out the default module path the server was compiled with.

       -showDefaultLibPath
               Print out the path libraries should be installed to.

       -showopts
               For each driver module installed, print out the list of options
               and their argument types.

       -weight nnn
               Set RGB weighting at 16 bpp.  The default is 565.  This applies
               only to those drivers which support 16 bpp.

       -verbose [n]
               Sets the verbosity level for information printed on stderr.  If
               the n value isn't supplied,  each  occurrence  of  this  option
               increments  the verbosity level.  When the n value is supplied,
               the  verbosity  level  is  set  to  that  value.   The  default
               verbosity level is 0.

       -version
               Print  out  the  server  version, patchlevel, release date, the
               operating system/platform it  was  built  on,  and  whether  it
               includes module loader support.

KEYBOARD

       The  Xorg  server  is  normally configured to recognize various special
       combinations of key presses that instruct the server  to  perform  some
       action,  rather  than  just  sending  the  key  press event to a client
       application. These actions  depend  on  the  XKB  keymap  loaded  by  a
       particular  keyboard  device and may or may not be available on a given
       configuration.

       The following  key  combinations  are  commonly  part  of  the  default
       XKEYBOARD keymap.

       Ctrl+Alt+Backspace
               Immediately  kills  the server -- no questions asked. It can be
               disabled by setting the DontZap xorg.conf(5) file option  to  a
               TRUE value.

               It   should   be   noted  that  zapping  is  triggered  by  the
               Terminate_Server action in the keyboard map. This action is not
               part  of  the  default  keymaps but can be enabled with the XKB
               option "terminate:ctrl_alt_bksp".

       Ctrl+Alt+Keypad-Plus
               Change video mode to next one specified  in  the  configuration
               file.  This can be disabled with the DontZoom xorg.conf(5) file
               option.

       Ctrl+Alt+Keypad-Minus
               Change  video  mode  to   previous   one   specified   in   the
               configuration  file.   This  can  be disabled with the DontZoom
               xorg.conf(5) file option.

       Ctrl+Alt+F1...F12
               For systems with  virtual  terminal  support,  these  keystroke
               combinations  are used to switch to virtual terminals 1 through
               12, respectively.  This can be disabled with  the  DontVTSwitch
               xorg.conf(5) file option.

CONFIGURATION

       Xorg   typically   uses  a  configuration  file  called  xorg.conf  and
       configuration files  with  the  suffix  .conf  in  a  directory  called
       xorg.conf.d  for  its  initial setup.  Refer to the xorg.conf(5) manual
       page for information about the format of this file.

       Xorg  has  a  mechanism  for  automatically   generating   a   built-in
       configuration  at  run-time when no xorg.conf file or xorg.conf.d files
       are present.  The  current  version  of  this  automatic  configuration
       mechanism works in two ways.

       The  first  is  via  enhancements that have made many components of the
       xorg.conf file optional.  This  means  that  information  that  can  be
       probed  or  reasonably deduced doesn't need to be specified explicitly,
       greatly reducing the amount of built-in configuration information  that
       needs to be generated at run-time.

       The   second  is  to  have  "safe"  fallbacks  for  most  configuration
       information.  This maximises the likelihood that the Xorg  server  will
       start  up  in some usable configuration even when information about the
       specific hardware is not available.

       The automatic configuration support for Xorg is work in  progress.   It
       is  currently aimed at the most popular hardware and software platforms
       supported by Xorg.  Enhancements are planned for future releases.

FILES

       The Xorg server config files can be found  in  a  range  of  locations.
       These  are  documented fully in the xorg.conf(5) manual page.  The most
       commonly used locations are shown here.

       /etc/X11/xorg.conf            Server configuration file.

       /etc/X11/xorg.conf-4          Server configuration file.

       /etc/xorg.conf                Server configuration file.

       /usr/etc/xorg.conf            Server configuration file.

       /usr/lib/X11/xorg.conf        Server configuration file.

       /etc/X11/xorg.conf.d          Server configuration directory.

       /etc/X11/xorg.conf.d-4        Server configuration directory.

       /etc/xorg.conf.d              Server configuration directory.

       /usr/etc/xorg.conf.d          Server configuration directory.

       /usr/lib/X11/xorg.conf.d      Server configuration directory.

       /var/log/Xorg.n.log           Server log file for display n.

       /usr/bin/*                    Client binaries.

       /usr/include/*                Header files.

       /usr/lib/*                    Libraries.

       /usr/share/fonts/X11/*        Fonts.

       /usr/share/X11/XErrorDB       Client error message database.

       /usr/lib/X11/app-defaults/*   Client resource specifications.

       /usr/share/man/man?/*         Manual pages.

       /etc/Xn.hosts                 Initial access control list  for  display
                                     n.

SEE ALSO

       X(7),  Xserver(1), xdm(1), xinit(1), xorg.conf(5), xvidtune(1), apm(4),
       ati(4), chips(4), cirrus(4), cyrix(4),  fbdev(4),  glide(4),  glint(4),
       i128(4),  i740(4),  imstt(4),  intel(4),  mga(4),  neomagic(4), nsc(4),
       nv(4),   openchrome    (4),    r128(4),    rendition(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),
       v4l(4), vesa(4), vmware(4),
       Web site <http://www.x.org>.

AUTHORS

       Xorg  has  many contributors world wide.  The names of most of them can
       be found in the documentation, ChangeLog files in the source tree,  and
       in the actual source code.

       Xorg was originally based on XFree86 4.4rc2.  That was originally based
       on X386 1.2 by Thomas Roell,  which  was  contributed  to  the  then  X
       Consortium's X11R5 distribution by SGCS.

       Xorg is released by the X.Org Foundation.

       The project that became XFree86 was originally founded in 1992 by David
       Dawes, Glenn Lai, Jim Tsillas and David Wexelblat.

       XFree86 was later integrated in the then X Consortium's  X11R6  release
       by a group of dedicated XFree86 developers, including the following:

           Stuart Anderson    anderson@metrolink.com
           Doug Anson         danson@lgc.com
           Gertjan Akkerman   akkerman@dutiba.twi.tudelft.nl
           Mike Bernson       mike@mbsun.mlb.org
           Robin Cutshaw      robin@XFree86.org
           David Dawes        dawes@XFree86.org
           Marc Evans         marc@XFree86.org
           Pascal Haible      haible@izfm.uni-stuttgart.de
           Matthieu Herrb     Matthieu.Herrb@laas.fr
           Dirk Hohndel       hohndel@XFree86.org
           David Holland      davidh@use.com
           Alan Hourihane     alanh@fairlite.demon.co.uk
           Jeffrey Hsu        hsu@soda.berkeley.edu
           Glenn Lai          glenn@cs.utexas.edu
           Ted Lemon          mellon@ncd.com
           Rich Murphey       rich@XFree86.org
           Hans Nasten        nasten@everyware.se
           Mark Snitily       mark@sgcs.com
           Randy Terbush      randyt@cse.unl.edu
           Jon Tombs          tombs@XFree86.org
           Kees Verstoep      versto@cs.vu.nl
           Paul Vixie         paul@vix.com
           Mark Weaver        Mark_Weaver@brown.edu
           David Wexelblat    dwex@XFree86.org
           Philip Wheatley    Philip.Wheatley@ColumbiaSC.NCR.COM
           Thomas Wolfram     wolf@prz.tu-berlin.de
           Orest Zborowski    orestz@eskimo.com

       Xorg  source  is  available from the FTP server <ftp://ftp.x.org/>, and
       from the X.Org server <http://gitweb.freedesktop.org/>.   Documentation
       and   other   information   can  be  found  from  the  X.Org  web  site
       <http://www.x.org/>.

LEGAL

       Xorg  is  copyright  software,  provided  under  licenses  that  permit
       modification  and redistribution in source and binary form without fee.
       Xorg is copyright by numerous authors and contributors from around  the
       world.   Licensing  information  can  be  found  at <http://www.x.org>.
       Refer to the source code for specific copyright notices.

       XFree86(TM) is a trademark of The XFree86 Project, Inc.

       X11(TM) and X Window System(TM) are trademarks of The Open Group.