User Commands XRANDR(1)
NAME
xrandr - primitive command line interface to RandR extension
SYNOPSIS
/usr/bin/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[-o orientation] [-s size] [-r rate] [-x] [-y]
DESCRIPTION
Xrandr is used to set the size, orientation and/or reflec-
tion 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 sametime by passing multiple --output options followed immedi-
ately 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
X Version 11 Last change: xrandr 1.3.3 1
User Commands XRANDR(1)without other options), xrandr will display more infor-
mation about the server state. Please note that thegamma and brightness informations are only approxima-
tions 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 configurationchanges 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. Notethis refers to the X screen abstraction, not the moni-
tor (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 pol-
ling for hardware changes.--noprimary
Don't define a primary output.X Version 11 Last change: xrandr 1.3.3 2
User Commands XRANDR(1)Per-output options
widthxheight[+x+y[/track_widthxtrack_height+track_x+track_y[/border_left/border_top/border_right/border_bottom]]]
--panning
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 thescreen size with --fb simultaneously.
--transform a,b,c,d,e,f,g,h,i
Specifies a transformation matrix to apply on the out-
put. 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 coordinatevector of a pixel in the graphic buffer. More pre-
cisely, the vector (x y) of the output pixel isextended to 3 values (x y w), with 1 as the w coordi-
nate and multiplied against the matrix. The final dev-
ice coordinates of the pixel are then calculated withthe 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 complextransformations such as keystone correction, or rota-
tion. 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 (screenX Version 11 Last change: xrandr 1.3.3 3
User Commands XRANDR(1) 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 ofthe --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 con-
figured monitors must fit within this size. When thisoption is not provided, xrandr computes the smallest
screen size that will hold the set of configured out-
puts; this option provides a way to override that behaviour.--fbmm widthxheight
Sets the reported values for the physical size of thescreen. 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 asso-
ciated 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 ormore 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.X Version 11 Last change: xrandr 1.3.3 4
User Commands XRANDR(1)--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 out-
put.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 coor-
dinates. 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' specifiesa counter-clockwise rotation.
--left-of, --right-of, --above, --below, --same-as another-
outputX Version 11 Last change: xrandr 1.3.3 5
User Commands XRANDR(1)Use one of these options to position the output rela-
tive to the position of another output. This allows convenient tiling of outputs within the screen. Theposition is always computed relative to the new posi-
tion 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 bespecified as a valid (see --prop) decimal or hexade-
cimal (with a leading 0x) value. Atom properties may beset to any of the valid atoms (see --prop). String pro-
perties 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 notrequired as xrandr tries to make sensible choices about
which crtc to use with each output. When that fails forsome reason, this option can override the normal selec-
tion.--gamma red:green:blue
Set the specified floating point values as gammacorrection on the crtc currently attached to this out-
put. 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. How-
ever, 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
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User Commands XRANDR(1) 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) AUTHORSKeith Packard, Open Source Technology Center, Intel Corpora-
tion. and Jim Gettys, Cambridge Research Laboratory, HP Labs, HP.X Version 11 Last change: xrandr 1.3.3 7
User Commands XRANDR(1)ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | x11/x11-server-utilities |
|_____________________________|_____________________________|
| Interface Stability | Volatile ||_____________________________|_____________________________|
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