NAME
xrandr - primitive command line interface to RandR extension
SYNOPSIS
xrandr [-help] [-display display] [-q] [-v] [--verbose] [--dryrun]
[--screen snum] [--q1] [--q12]
RandR version 1.3 options
[--current] [--noprimary]
Per-output options
[--panning
widthxheight[+x+y[/track_widthxtrack_height+track_x+track_y[/border_left/border_top/border_right/border_bottom]]]]
[--scale xxy] [--transform a,b,c,d,e,f,g,h,i] [--primary]
RandR version 1.2 options
[--prop] [--fb widthxheight] [--fbmm widthxheight] [--dpi dpi]
[--newmode name mode] [--rmmode name] [--addmode output name]
[--delmode output name]
Per-output options
[--output output] [--auto] [--mode mode] [--preferred] [--pos xxy]
[--rate rate] [--reflect reflection] [--rotate orientation] [--left-of
output] [--right-of output] [--above output] [--below output] [--same-
as output] [--set property value] [--off] [--crtc crtc] [--gamma
red:green:blue] [--brightness brightness]
RandR version 1.0 and version 1.1 options
[-o orientation] [-s size] [-r rate] [-x] [-y]
DESCRIPTION
Xrandr is used to set the size, orientation and/or reflection of the
outputs for a screen. It can also set the screen size.
If invoked without any option, it will dump the state of the outputs,
showing the existing modes for each of them, with a '+' after the
preferred mode and a '*' after the current mode.
There are a few global options. Other options modify the last output
that is specified in earlier parameters in the command line. Multiple
outputs may be modified at the same time by passing multiple --output
options followed immediately by their corresponding modifying options.
-help Print out a summary of the usage and exit.
-v, --version
Print out the RandR version reported by the X server and exit.
--verbose
Causes xrandr to be more verbose. When used with -q (or without
other options), xrandr will display more information about the
server state. Please note that the gamma and brightness
informations are only approximations of the complete color
profile stored in the server. When used along with options that
reconfigure the system, progress will be reported while
executing the configuration changes.
-q, --query
When this option is present, or when no configuration changes
are requested, xrandr will display the current state of the
system.
--dryrun
Performs all the actions specified except that no changes are
made.
--nograb
Apply the modifications without grabbing the screen. It avoids
to block other applications during the update but it might also
cause some applications that detect screen resize to receive old
values.
-d, -display name
This option selects the X display to use. Note this refers to
the X screen abstraction, not the monitor (or output).
--screen snum
This option selects which screen to manipulate. Note this refers
to the X screen abstraction, not the monitor (or output).
--q1 Forces the usage of the RandR version 1.1 protocol, even if a
higher version is available.
--q12 Forces the usage of the RandR version 1.2 protocol, even if the
display does not report it as supported or a higher version is
available.
RandR version 1.3 options
Options for RandR 1.3 are used as a superset of the options for RandR
1.2.
--current
Return the current screen configuration, without polling for
hardware changes.
--noprimary
Don't define a primary output.
Per-output options
--panning
widthxheight[+x+y[/track_widthxtrack_height+track_x+track_y[/border_left/border_top/border_right/border_bottom]]]
This option sets the panning parameters. As soon as panning is
enabled, the CRTC position can change with every pointer move.
The first four parameters specify the total panning area, the
next four the pointer tracking area (which defaults to the same
area). The last four parameters specify the border and default
to 0. A width or height set to zero disables panning on the
according axis. You typically have to set the screen size with
--fb simultaneously.
--transform a,b,c,d,e,f,g,h,i
Specifies a transformation matrix to apply on the output.
Automatically a bilinear filter is selected. The mathematical
form corresponds to:
a b c
d e f
g h i
The transformation is based on homogeneous coordinates. The
matrix multiplied by the coordinate vector of a pixel of the
output gives the transformed coordinate vector of a pixel in the
graphic buffer. More precisely, the vector (x y) of the output
pixel is extended to 3 values (x y w), with 1 as the w
coordinate and multiplied against the matrix. The final device
coordinates of the pixel are then calculated with the so-called
homogenic division by the transformed w coordinate. In other
words, the device coordinates (x' y') of the transformed pixel
are:
x' = (ax + by + c) / w' and
y' = (dx + ey + f) / w' ,
with w' = (gx + hy + i) .
Typically, a and e corresponds to the scaling on the X and Y
axes, c and f corresponds to the translation on those axes, and
g, h, and i are respectively 0, 0 and 1. The matrix can also be
used to express more complex transformations such as keystone
correction, or rotation. For a rotation of an angle T, this
formula can be used:
cos T -sin T 0
sin T cos T 0
0 0 1
As a special argument, instead of passing a matrix, one can pass
the string none, in which case the default values are used (a
unit matrix without filter).
--scale xxy
Changes the dimensions of the output picture. Values superior to
1 will lead to a compressed screen (screen dimension bigger than
the dimension of the output mode), and values below 1 leads to a
zoom in on the output. This option is actually a shortcut
version of the --transform option.
--primary
Set the output as primary. It will be sorted first in Xinerama
and RANDR geometry requests.
RandR version 1.2 options
These options are only available for X server supporting RandR version
1.2 or newer.
--prop, --properties
This option causes xrandr to display the contents of properties
for each output. --verbose also enables --prop.
--fb widthxheight
Reconfigures the screen to the specified size. All configured
monitors must fit within this size. When this option is not
provided, xrandr computes the smallest screen size that will
hold the set of configured outputs; this option provides a way
to override that behaviour.
--fbmm widthxheight
Sets the reported values for the physical size of the screen.
Normally, xrandr resets the reported physical size values to
keep the DPI constant. This overrides that computation.
--dpi dpi
This also sets the reported physical size values of the screen,
it uses the specified DPI value to compute an appropriate
physical size using whatever pixel size will be set.
--newmode name mode
New modelines can be added to the server and then associated
with outputs. This option does the former. The mode is
specified using the ModeLine syntax for xorg.conf: hdisp
hsyncstart hsyncend htotal vdisp vsyncstart vsyncend vtotal
flags. flags can be zero or more of +HSync, -HSync, +VSync,
-VSync, Interlace, DoubleScan, CSync, +CSync, -CSync. Several
tools permit to compute the usual modeline from a height, width,
and refresh rate, for instance you can use cvt.
--rmmode name
This removes a mode from the server if it is otherwise unused.
--addmode output name
Add a mode to the set of valid modes for an output.
--delmode output name
Remove a mode from the set of valid modes for an output.
Per-output options
--output output
Selects an output to reconfigure. Use either the name of the
output or the XID.
--auto For connected but disabled outputs, this will enable them using
their preferred mode (or, something close to 96dpi if they have
no preferred mode). For disconnected but enabled outputs, this
will disable them.
--mode mode
This selects a mode. Use either the name or the XID for mode
--preferred
This selects the same mode as --auto, but it doesn't
automatically enable or disable the output.
--pos xxy
Position the output within the screen using pixel coordinates.
In case reflection or rotation is applied, the translation is
applied after the effects.
--rate rate
This marks a preference for refresh rates close to the specified
value, when multiple modes have the same name, this will select
the one with the nearest refresh rate.
--reflect reflection
Reflection can be one of 'normal' 'x', 'y' or 'xy'. This causes
the output contents to be reflected across the specified axes.
--rotate rotation
Rotation can be one of 'normal', 'left', 'right' or 'inverted'.
This causes the output contents to be rotated in the specified
direction. 'right' specifies a clockwise rotation of the picture
and 'left' specifies a counter-clockwise rotation.
--left-of, --right-of, --above, --below, --same-as another-output
Use one of these options to position the output relative to the
position of another output. This allows convenient tiling of
outputs within the screen. The position is always computed
relative to the new position of the other output, so it is not
valid to say --output a --left-of b --output b --left-of a.
--set property value
Sets an output property. Integer properties may be specified as
a valid (see --prop) decimal or hexadecimal (with a leading 0x)
value. Atom properties may be set to any of the valid atoms (see
--prop). String properties may be set to any value.
--off Disables the output.
--crtc crtc
Uses the specified crtc (either as an index in the list of CRTCs
or XID). In normal usage, this option is not required as xrandr
tries to make sensible choices about which crtc to use with each
output. When that fails for some reason, this option can
override the normal selection.
--gamma red:green:blue
Set the specified floating point values as gamma correction on
the crtc currently attached to this output. Note that you cannot
get two different values for cloned outputs (i.e.: which share
the same crtc) and that switching an output to another crtc
doesn't change the crtc gamma corrections at all.
--brightness brightness
Multiply the gamma values on the crtc currently attached to the
output to specified floating value. Useful for overly bright or
overly dim outputs. However, this is a software only
modification, if your hardware has support to actually change
the brightness, you will probably prefer to use xbacklight.
RandR version 1.1 options
These options are available for X servers supporting RandR version 1.1
or older. They are still valid for newer X servers, but they don't
interact sensibly with version 1.2 options on the same command line.
-s, --size size-index or --size widthxheight
This sets the screen size, either matching by size or using the
index into the list of available sizes.
-r, --rate, --refresh rate
This sets the refresh rate closest to the specified value.
-o, --orientation rotation
This specifies the orientation of the screen, and can be one of
normal, inverted, left or right.
-x Reflect across the X axis.
-y Reflect across the Y axis.
EXAMPLES
Sets an output called LVDS to its preferred mode, and on its right put
an output called VGA to preferred mode of a screen which has been
physically rotated clockwise:
xrandr --output LVDS --auto --rotate normal --pos 0x0 --output
VGA --auto --rotate left --right-of LVDS
Forces to use a 1024x768 mode on an output called VGA:
xrandr --newmode "1024x768" 63.50 1024 1072 1176 1328 768 771
775 798 -hsync +vsync
xrandr --addmode VGA 1024x768
xrandr --output VGA --mode 1024x768
Enables panning on a 1600x768 desktop while displaying 1024x768 mode on
an output called VGA:
xrandr --fb 1600x768 --output VGA --mode 1024x768 --panning
1600x0
Have one small 1280x800 LVDS screen showing a small version of a huge
3200x2000 desktop, and have a big VGA screen display the surrounding of
the mouse at normal size.
xrandr --fb 3200x2000 --output LVDS --scale 2.5x2.5 --output VGA
--pos 0x0 --panning 3200x2000+0+0/3200x2000+0+0/64/64/64/64
Displays the VGA output in trapezoid shape so that it is keystone
corrected when the projector is slightly above the screen:
xrandr --fb 1024x768 --output VGA --transform
1.24,0.16,-124,0,1.24,0,0,0.000316,1
SEE ALSO
Xrandr(3), cvt(1), xkeystone(1), xbacklight(1)
AUTHORS
Keith Packard, Open Source Technology Center, Intel Corporation. and
Jim Gettys, Cambridge Research Laboratory, HP Labs, HP.