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Xorg(1x) Xorg(1x)
NAME
Xorg - X11R6 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 from XFree86 4.4rc2 by the X.Org Foundation.
The XFree86 4.4rc2 release was originally derived from X386 1.2 by
Thomas Roell which was contributed to X11R5 by Snitily Graphics Con-
sulting Service. The Xorg server architecture includes among many
other things a loadable module system derived from code donated by
Metro Link, Inc. The current Xorg release is compatible with X11R6.6.
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, SPARC and PowerPC. The most widely supported oper-
ating systems are the free/OpenSource UNIX-like systems such as Linux,
FreeBSD, NetBSD and OpenBSD. Commercial UNIX operating systems such
as Solaris (x86) and UnixWare are also supported. Other supported
operating systems include LynxOS, and GNU Hurd. Darwin and Mac OS X
are supported with the XDarwin(1) X server. Win32/Cygwin is supported
with the XWin 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 mecha-
nisms.
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/X11R6/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(5x) 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 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
parameters, with their defaults, are described in the xorg.conf(5x)
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 such as Linux, BSD, SVR3 and SVR4,
that have virtual terminal support.
-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(5x) file option.
-allowNonLocalModInDev
Allow changes to keyboard and mouse settings from non-local
clients. By default, connections from non-local clients are
not allowed to do this. This is equivalent to the AllowNonLo-
calModInDev xorg.conf(5x) 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(5x) 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.
-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(5x) 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.
-disableModInDev
Disable dynamic modification of input device settings. This
is equivalent to the DisableModInDev xorg.conf(5x) file
option.
-disableVidMode
Disable the 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(5x) 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 frame-
buffer (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 sup-
port 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.
-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(5x) file InputDevice section called key-
board-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(5x) 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
applications don't like this pixmap format, even though it is
a perfectly legal format. This is equivalent to the Pixmap
xorg.conf(5x) 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(5x) file option.
-pointer pointer-name
Use the xorg.conf(5x) 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.
-probeonly
Causes the server to exit after the device probing stage. The
xorg.conf(5x) file is still used when this option is given, so
information that can be auto-detected should be commented out.
-quiet Suppress most informational messages at startup. The ver-
bosity 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.
-scanpci
When this option is specified, the Xorg server scans the PCI
bus, and prints out some information about each device that
was detected. See also scanpci(1) and pcitweak(1).
-screen screen-name
Use the xorg.conf(5x) file Screen section called screen-name.
By default the screens referenced by the default Layout sec-
tion 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.
-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.
-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 con-
fig search path for all other users.
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. The default XKEYBOARD keymap defines the key combina-
tions listed below. The server also has these key combinations
builtin to its event handler for cases where the XKEYBOARD extension
is not being used. When using the XKEYBOARD extension, which key com-
binations perform which actions is completely configurable.
For more information about when the builtin event handler is used to
recognize the special key combinations, see the documentation on the
HandleSpecialKeys option in the xorg.conf(5x) man page.
The special combinations of key presses recognized directly by Xorg
are:
Ctrl+Alt+Backspace
Immediately kills the server -- no questions asked. This can
be disabled with the DontZap xorg.conf(5x) file option.
Ctrl+Alt+Keypad-Plus
Change video mode to next one specified in the configuration
file. This can be disabled with the DontZoom xorg.conf(5x)
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(5x) file option.
Ctrl+Alt+Keypad-Multiply
Not treated specially by default. If the AllowClosedownGrabs
xorg.conf(5x) file option is specified, this key sequence
kills clients with an active keyboard or mouse grab as well as
killing any application that may have locked the server, nor-
mally using the XGrabServer(3x) Xlib function.
Ctrl+Alt+Keypad-Divide
Not treated specially by default. If the AllowDeactivateGrabs
xorg.conf(5x) file option is specified, this key sequence
deactivates any active keyboard and mouse grabs.
Ctrl+Alt+F1...F12
For BSD and Linux 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(5x) file option.
CONFIGURATION
Xorg typically uses a configuration file called xorg.conf for its ini-
tial setup. Refer to the xorg.conf(5x) manual page for information
about the format of this file.
Starting with version 4.4, Xorg has a mechanism for automatically gen-
erating a built-in configuration at run-time when no xorg.conf file is
present. The current version of this automatic configuration mecha-
nism works in three 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 use an external utility called getconfig(1), when
available, to use meta-configuration information to generate a suit-
able configuration for the primary video device. The meta-configura-
tion information can be updated to allow an existing installation to
get the best out of new hardware or to work around bugs that are found
post-release.
The third 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 spe-
cific 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 file can be found in a range of locations.
These are documented fully in the xorg.conf(5x) 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/X11R6/etc/xorg.conf Server configuration file.
/usr/X11R6/lib/X11/xorg.conf Server configuration file.
/var/log/Xorg.n.log Server log file for display n.
/usr/X11R6/bin/* Client binaries.
/usr/X11R6/include/* Header files.
/usr/X11R6/lib/* Libraries.
/usr/X11R6/lib/X11/fonts/* Fonts.
/usr/X11R6/lib/X11/rgb.txt Color names to RGB mapping.
/usr/X11R6/lib/X11/XErrorDB Client error message database.
/usr/X11R6/lib/X11/app-defaults/*
Client resource specifications.
/usr/X11R6/man/man?/* Manual pages.
/etc/Xn.hosts Initial access control list for display
n.
SEE ALSO
X(7x), Xserver(1x), xdm(1x), xinit(1x), xorg.conf(5x), xorgconfig(1x),
xorgcfg(1x), xvidtune(1x), apm(4x), ati(4x), chips(4x), cirrus(4x),
cyrix(4x), fbdev(4x), glide(4x), glint(4x), i128(4x), i740(4x),
i810(4x), imstt(4x), mga(4x), neomagic(4x), nsc(4x), nv(4x), r128(4x),
rendition(4x), s3virge(4x), siliconmotion(4x), sis(4x), sunbw2(4x),
suncg14(4x), suncg3(4x), suncg6(4x), sunffb(4x), sunleo(4x),
suntcx(4x), tdfx(4x), tga(4x), trident(4x), tseng(4x), v4l(4x),
vesa(4x), vga(4x), vmware(4x),
Web site .
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 .
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.Org Version 6.8.2 Xorg(1x)
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