Xorg(1)                                                                Xorg(1)



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 sup-
       ported 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 operat-
       ing systems such as UnixWare are also supported.  Other supported oper-
       ating  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 prefer-
       ence 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/X11R7/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 parame-
       ters 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 param-
       eters,  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 Allow-
               MouseOpenFail 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  frame-
               buffer (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  xvid-
               tune  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 ter-
               minal.  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  occur-
               rence  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 appli-
               cations don't like this pixmap format, even though it is a per-
               fectly   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 Lay-
               out 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  ver-
               bosity 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 appli-
       cation. These actions depend on the XKB keymap loaded by  a  particular
       keyboard  device  and may or may not be available on a given configura-
       tion.

       The following key combinations are commonly part of the  default  XKEY-
       BOARD 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 Termi-
               nate_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  configura-
               tion 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 com-
               binations 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 configu-
       ration files with the suffix .conf in a directory called __xconfigdir__
       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 configura-
       tion  at  run-time  when  no xorg.conf file or __xconfigdir__ 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 informa-
       tion.  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/X11R7/etc/xorg.conf      Server configuration file.

       /usr/X11R7/lib/X11/xorg.conf  Server configuration file.

       /etc/X11/__xconfigdir__       Server configuration directory.

       /etc/X11/__xconfigdir__-4     Server configuration directory.

       /etc/__xconfigdir__           Server configuration directory.

       /usr/X11R7/etc/__xconfigdir__ Server configuration directory.

       /usr/X11R7/lib/X11/__xconfigdir__
                                     Server configuration directory.

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

       /usr/X11R7/bin/*              Client binaries.

       /usr/X11R7/include/*          Header files.

       /usr/X11R7/lib/*              Libraries.

       __datadir__/fonts/X11/*       Fonts.

       /usr/X11R7/share/X11/XErrorDB Client error message database.

       /usr/X11R7/lib/X11/app-defaults/*
                                     Client resource specifications.

       /usr/X11R7/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  Con-
       sortium'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 modifi-
       cation  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.



                                 X Version 11                          Xorg(1)

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