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CentOS 7.0 - man page for xorg (centos section 1)

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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 oper-
       ating 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, Free-
       BSD, 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  sup-
       ported 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 Sys-
	   tem 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.   XLO-
       CAL=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  con-
       nection.  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 param-
       eters:  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  meth-
       ods.  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 ini-
	       tialised.  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 AllowNonLocalXvid-
	       tune 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  directo-
	       ries  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 DisableVidModeExten-
	       sion 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  frame-
	       buffer  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 key-
	       board.  In the absence of both a Layout section and this option, the  first  rele-
	       vant 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.

       -novtswitch
	       Disable the automatic switching on X server reset and shutdown to the VT that  was
	       active when the server started, if supported by the OS.

       -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 Input-
	       Device 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.

       -sharevts
	       Share virtual terminals with another X server, if supported by the OS.

       -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  rea-
	       sons.   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/plat-
	       form 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),  xkeyboard-config  (7),
       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 doc-
       umentation, 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  dedi-
       cated 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 redistri-
       bution 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-server 1.15.0				  Xorg(1)
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