.\" $XdotOrg: xserver/xorg/hw/xfree86/doc/man/Xorg.man.pre,v 1.3 2005/07/04 18:41:01 ajax Exp $
.\" shorthand for double quote that works everywhere.
.ds q \N'34'
.TH Xorg 1 "xorg-server 1.20.13" "X Version 11"
.SH NAME
Xorg - X11R7 X server
.SH SYNOPSIS
.B Xorg
.RI [\fB:\fP display ]
.RI [ option
.IR ... ]
.SH DESCRIPTION
.B 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.
.PP
This work was derived by the X.Org Foundation from the XFree86 Project's
.I "XFree86\ 4.4rc2"
release.
The XFree86 release was originally derived from
.I "X386\ 1.2"
by Thomas Roell which was contributed to X11R5 by Snitily Graphics
Consulting Service.
.SH PLATFORMS
.PP
.B 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.
.PP
.SH "NETWORK CONNECTIONS"
.B Xorg
supports connections made using the following reliable
byte-streams:
.TP 4
.I "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.  See the
"LOCAL CONNECTIONS" section of X(7) for details.
.TP 4
.I TCP/IP
.B Xorg
listens on port
.RI 6000+ n ,
where
.I n
is the display number.  This connection type is usually disabled by default,
but may be enabled with the
.B \-listen
option (see the Xserver(1) man page for details).
.SH OPTIONS
.B 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.
.PP
In addition to the normal server options described in the
Xserver(1) manual page,
.B Xorg
accepts the following command line switches:
.TP 8
.BI vt XX
.I XX
specifies the Virtual Terminal device number which
.B Xorg
will use.  Without this option,
.B 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.
.TP
.B \-allowMouseOpenFail
Allow the server to start up even if the mouse device can't be opened
or initialised.  This is equivalent to the
.B AllowMouseOpenFail
xorg.conf(5) file option.
.TP 8
.B \-allowNonLocalXvidtune
Make the VidMode extension available to remote clients.  This allows
the xvidtune client to connect from another host.  This is equivalent
to the
.B AllowNonLocalXvidtune
xorg.conf(5) file option.  By default non-local
connections are not allowed.
.TP 8
.BI \-bgamma " value"
Set the blue gamma correction.
.I value
must be between 0.1 and 10.
The default is 1.0.  Not all drivers support this.  See also the
.BR \-gamma ,
.BR \-rgamma ,
and
.B \-ggamma
options.
.TP 8
.BI \-bpp " n"
No longer supported.  Use
.B \-depth
to set the color depth, and use
.B \-fbbpp
if you really need to force a non-default framebuffer (hardware) pixel
format.
.TP 8
.BI \-config " file"
Read the server configuration from
.IR 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.
.TP 8
.BI \-configdir " directory"
Read the server configuration files from
.IR 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.
.TP 8
.B \-configure
When this option is specified, the
.B 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).
.TP 8
.BI "\-crt /dev/tty" XX
SCO only.  This is the same as the
.B vt
option, and is provided for compatibility with the native SCO X server.
.TP 8
.BI \-depth " n"
Sets the default color depth.  Legal values are 1, 4, 8, 15, 16, and
24.  Not all drivers support all values.
.TP 8
.B \-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
.B DisableVidModeExtension
xorg.conf(5) file option.
.TP 8
.B \-fbbpp \fIn\fP
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
.B \-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.
.TP 8
.B \-flipPixels
Swap the default values for the black and white pixels.
.TP 8
.BI \-gamma " value"
Set the gamma correction.
.I 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
.BR \-rgamma ,
.BR \-bgamma ,
and
.B \-ggamma
options.  Not all drivers support this.
.TP 8
.BI \-ggamma " value"
Set the green gamma correction.
.I value
must be between 0.1 and 10.  The default is 1.0.  Not all drivers support
this.  See also the
.BR \-gamma ,
.BR \-rgamma ,
and
.B \-bgamma
options.
.TP 8
.B \-ignoreABI
The
.B 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.
.TP 8
.B \-isolateDevice \fIbus\-id\fP
Restrict device resets to the device at
.IR bus\-id .
The
.I bus\-id
string has the form
.IB bustype : bus : device : function
(e.g., \(oqPCI:1:0:0\(cq).
At present, only isolation of PCI devices is supported; i.e., this option
is ignored if
.I bustype
is anything other than \(oqPCI\(cq.
.TP 8
.B \-keeptty
Prevent the server from detaching its initial controlling terminal. If you
want to use systemd-logind integration you must specify this option.
Not all platforms support (or can use) this option.
.TP 8
.BI \-keyboard " keyboard-name"
Use the xorg.conf(5) file
.B InputDevice
section called
.I keyboard-name
as the core keyboard.  This option is ignored when the
.B Layout
section specifies a core keyboard.  In the absence of both a Layout
section and this option, the first relevant
.B InputDevice
section is used for the core keyboard.
.TP 8
.BI \-layout " layout-name"
Use the xorg.conf(5) file
.B Layout
section called
.IR layout-name .
By default the first
.B Layout
section is used.
.TP 8
.BI \-logfile " filename"
Use the file called
.I filename
as the
.B Xorg
server log file.  The default log file when running as root is
.BI /var/log/Xorg. n .log
and for non root it is
.BI $XDG_DATA_HOME/xorg/Xorg. n .log
where
.I n
is the display number of the
.B 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).
.TP 8
.BR \-logverbose " [\fIn\fP]"
Sets the verbosity level for information printed to the
.B Xorg
server log file.  If the
.I n
value isn't supplied, each occurrence of this option increments the log
file verbosity level.  When the
.I n
value is supplied, the log file verbosity level is set to that value.
The default log file verbosity level is 3.
.TP 8
.BI \-modulepath " searchpath"
Set the module search path to
.IR searchpath .
.I searchpath
is a comma separated list of directories to search for
.B Xorg
server modules.  This option is only available when the server is run
as root (i.e, with real-uid 0).
.TP 8
.B \-noautoBindGPU
Disable automatically setting secondary GPUs up as output sinks and offload
sources. This is equivalent to setting the
.B AutoBindGPU
xorg.conf(5) file option. To
.B false.
.TP 8
.B \-nosilk
Disable Silken Mouse support.
.TP 8
.B \-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.
.TP 8
.BI \-pointer " pointer-name"
Use the xorg.conf(5) file
.B InputDevice
section called
.I pointer-name
as the core pointer.  This option is ignored when the
.B Layout
section specifies a core pointer.  In the absence of both a Layout
section and this option, the first relevant
.B InputDevice
section is used for the core pointer.
.TP 8
.B \-quiet
Suppress most informational messages at startup.  The verbosity level
is set to zero.
.TP 8
.BI \-rgamma " value"
Set the red gamma correction.
.I value
must be between 0.1 and 10.  The default is 1.0.  Not all drivers support
this.  See also the
.BR \-gamma ,
.BR \-bgamma ,
and
.B \-ggamma
options.
.TP 8
.B \-sharevts
Share virtual terminals with another X server, if supported by the OS.
.TP 8
.BI \-screen " screen-name"
Use the xorg.conf(5) file
.B Screen
section called
.IR screen-name .
By default the screens referenced by the default
.B Layout
section are used, or the first
.B Screen
section when there are no
.B Layout
sections.
.TP 8
.B \-showconfig
This is the same as the
.B \-version
option, and is included for compatibility reasons.  It may be removed
in a future release, so the
.B \-version
option should be used instead.
.TP 8
.B \-showDefaultModulePath
Print out the default module path the server was compiled with.
.TP 8
.B \-showDefaultLibPath
Print out the path libraries should be installed to.
.TP 8
.B \-showopts
For each driver module installed, print out the list of options and their
argument types.
.TP 8
.BI \-weight " nnn"
Set RGB weighting at 16 bpp.  The default is 565.  This applies only to
those drivers which support 16 bpp.
.TP 8
.BR \-verbose " [\fIn\fP]"
Sets the verbosity level for information printed on stderr.  If the
.I n
value isn't supplied, each occurrence of this option increments the
verbosity level.  When the
.I n
value is supplied, the verbosity level is set to that value.  The default
verbosity level is 0.
.TP 8
.B \-version
Print out the server version, patchlevel, release date, the operating
system/platform it was built on, and whether it includes module loader
support.
.SH "KEYBOARD"
.PP
The
.B 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.
.PP
The following key combinations are commonly part of the default XKEYBOARD
keymap.
.TP 8
.B Ctrl+Alt+Backspace
Immediately kills the server -- no questions asked. It can be disabled by
setting the
.B DontZap
xorg.conf(5) file option to a TRUE value.
.PP
.RS 8
It should be noted that zapping is triggered by the
.B Terminate_Server
action in the keyboard map. This action is not part of the default keymaps
but can be enabled with the XKB option
.B \*qterminate:ctrl_alt_bksp\*q.
.RE
.TP 8
.B Ctrl+Alt+Keypad-Plus
Change video mode to next one specified in the configuration file.
This can be disabled with the
.B DontZoom
xorg.conf(5) file option.
.TP 8
.B Ctrl+Alt+Keypad-Minus
Change video mode to previous one specified in the configuration file.
This can be disabled with the
.B DontZoom
xorg.conf(5) file option.
.TP 8
.B 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
.B DontVTSwitch
xorg.conf(5) file option.
.SH CONFIGURATION
.B Xorg
typically uses a configuration file called
.B xorg.conf
and configuration files with the suffix
.I .conf
in a directory called
.B xorg.conf.d
for its initial setup.
Refer to the xorg.conf(5) manual page for information
about the format of this file.
.PP
.B Xorg
has a mechanism for automatically generating a built-in configuration
at run-time when no
.B xorg.conf
file or
.B xorg.conf.d
files are present.  The current version of this automatic configuration
mechanism works in two ways.
.PP
The first is via enhancements that have made many components of the
.B 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.
.PP
The second is to have "safe" fallbacks for most configuration information.
This maximises the likelihood that the
.B Xorg
server will start up in some usable configuration even when information
about the specific hardware is not available.
.PP
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.
.SH FILES
The
.B 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.
.TP 30
.B /etc/X11/xorg.conf
Server configuration file.
.TP 30
.B /etc/X11/xorg.conf-4
Server configuration file.
.TP 30
.B /etc/xorg.conf
Server configuration file.
.TP 30
.B /usr/etc/xorg.conf
Server configuration file.
.TP 30
.B /usr/lib/X11/xorg.conf
Server configuration file.
.TP 30
.B /etc/X11/xorg.conf.d
Server configuration directory.
.TP 30
.B /etc/X11/xorg.conf.d-4
Server configuration directory.
.TP 30
.B /etc/xorg.conf.d
Server configuration directory.
.TP 30
.B /usr/etc/xorg.conf.d
Server configuration directory.
.TP 30
.B /usr/lib/X11/xorg.conf.d
Server configuration directory.
.TP 30
.BI /var/log/Xorg. n .log
Server log file for display
.IR n .
.TP 30
.B /usr/bin/\(**
Client binaries.
.TP 30
.B /usr/include/\(**
Header files.
.TP 30
.B /usr/lib/\(**
Libraries.
.TP 30
.B /usr/share/fonts/X11/\(**
Fonts.
.TP 30
.B /usr/share/X11/XErrorDB
Client error message database.
.TP 30
.B /usr/lib/X11/app-defaults/\(**
Client resource specifications.
.TP 30
.B /usr/share/man/man?/\(**
Manual pages.
.TP 30
.BI /etc/X n .hosts
Initial access control list for display
.IR n .
.SH "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),
.br
Web site
.IR <https://www.x.org> .

.SH 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.
.PP
Xorg was originally based on XFree86 4.4rc2.
That was originally based on \fIX386 1.2\fP by Thomas Roell, which
was contributed to the then X Consortium's X11R5 distribution by SGCS.
.PP
Xorg is released by the X.Org Foundation.
.PP
The project that became XFree86 was originally founded in 1992 by
David Dawes, Glenn Lai, Jim Tsillas and David Wexelblat.
.PP
XFree86 was later integrated in the then X Consortium's X11R6 release
by a group of dedicated XFree86 developers, including the following:
.PP
.RS 4
.nf
Stuart Anderson    \fIanderson@metrolink.com\fP
Doug Anson         \fIdanson@lgc.com\fP
Gertjan Akkerman   \fIakkerman@dutiba.twi.tudelft.nl\fP
Mike Bernson       \fImike@mbsun.mlb.org\fP
Robin Cutshaw      \fIrobin@XFree86.org\fP
David Dawes        \fIdawes@XFree86.org\fP
Marc Evans         \fImarc@XFree86.org\fP
Pascal Haible      \fIhaible@izfm.uni-stuttgart.de\fP
Matthieu Herrb     \fIMatthieu.Herrb@laas.fr\fP
Dirk Hohndel       \fIhohndel@XFree86.org\fP
David Holland      \fIdavidh@use.com\fP
Alan Hourihane     \fIalanh@fairlite.demon.co.uk\fP
Jeffrey Hsu        \fIhsu@soda.berkeley.edu\fP
Glenn Lai          \fIglenn@cs.utexas.edu\fP
Ted Lemon          \fImellon@ncd.com\fP
Rich Murphey       \fIrich@XFree86.org\fP
Hans Nasten        \fInasten@everyware.se\fP
Mark Snitily       \fImark@sgcs.com\fP
Randy Terbush      \fIrandyt@cse.unl.edu\fP
Jon Tombs          \fItombs@XFree86.org\fP
Kees Verstoep      \fIversto@cs.vu.nl\fP
Paul Vixie         \fIpaul@vix.com\fP
Mark Weaver        \fIMark_Weaver@brown.edu\fP
David Wexelblat    \fIdwex@XFree86.org\fP
Philip Wheatley    \fIPhilip.Wheatley@ColumbiaSC.NCR.COM\fP
Thomas Wolfram     \fIwolf@prz.tu-berlin.de\fP
Orest Zborowski    \fIorestz@eskimo.com\fP
.fi
.RE
.PP
Xorg source is available from the FTP server
\fI<ftp://ftp.x.org/>\fP, and from the X.Org
server \fI<https://gitlab.freedesktop.org/xorg/>\fP.  Documentation and other
information can be found from the X.Org web site
\fI<https://www.x.org/>\fP.

.SH LEGAL
.PP
.B Xorg
is copyright software, provided under licenses that permit modification
and redistribution in source and binary form without fee.
.B Xorg is copyright by numerous authors and
contributors from around the world.  Licensing information can be found
at
.IR <https://www.x.org> .
Refer to the source code for specific copyright notices.
.PP
.B XFree86(TM)
is a trademark of The XFree86 Project, Inc.
.PP
.B X11(TM)
and
.B X Window System(TM)
are trademarks of The Open Group.
