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Manual: xrandr

XRANDR(1) General Commands Manual XRANDR(1)

NAME
xrandr - primitive command line interface to RandR extension

SYNOPSIS
xrandr [--help] [--display display] [-q] [-v] [--verbose] [--dryrun] [--screen snum] [--q1] [--q12] [--current]
[--noprimary] [--panning widthxheight[+x+y[/track_widthxtrack_height+track_x+track_y[/border_left/border_top/bor‐
der_right/border_bottom]]]] [--scale x[xy]] [--scale-from wxh] [--transform a,b,c,d,e,f,g,h,i] [--primary] [--prop]
[--fb widthxheight] [--fbmm widthxheight] [--dpi dpi] [--dpi from-output] [--newmode name mode] [--rmmode name]
[--addmode output name] [--delmode output name] [--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] [-o orientation] [-s size] [-r rate] [-x] [-y] [--listproviders] [--setprovideroutputsource
provider source] [--setprovideroffloadsink provider sink] [--listmonitors] [--listactivemonitors] [--setmonitor name
geometry outputs] [--delmonitor name]

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 modes 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 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 without other options), xrandr will display more in‐
formation about the server state. Please note that the gamma and brightness information 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 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 1.5 options
Options for RandR 1.5 are used as a superset of the options for RandR 1.4.

--listmonitors
Report information about all defined monitors.

--listactivemonitors
Report information about currently active monitors.

--setmonitor name geometry outputs
Define a new monitor with the given geometry and associated to the given outputs. The output list is either
the keyword none or a comma-separated list of outputs. The geometry is either the keyword auto, in which case
the monitor will automatically track the geometry of the associated outputs, or a manual specification in the
form w/mmwxh/mmh+x+y where w, h, x, y are in pixels and mmw, mmh are the physical dimensions of the monitor.

--delmonitor name
Delete the given user-defined monitor.

RandR version 1.4 options
Options for RandR 1.4 are used as a superset of the options for RandR 1.3.

--listproviders
Report information about the providers available.

--setprovideroutputsource provider source
Set source as the source of display output images for provider. This is only possible if source and provider
have the Source Output and Sink Output capabilities, respectively. If source is 0x0, then provider is discon‐
nected from its current output source.

--setprovideroffloadsink provider sink
Set provider as a render offload device for sink. This is only possible if provider and sink have the Source
Offload and Sink Offload capabilities, respectively. If sink is 0x0, then provider is disconnected from its
current render offload sink.

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/bor‐
der_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. A bilinear filter is selected automatically unless
the --filter parameter is also specified. 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 multi‐
plied against the matrix. The final device coordinates of the pixel are then calculated with the so-called ho‐
mogenic 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).

--filter filtermode
Chooses the scaling filter method to be applied when the screen is scaled or transformed. Can be either 'bi‐
linear' or 'nearest'.

--scale x[xy]
Changes the dimensions of the output picture. If the y value is omitted, the x value will be used for both
dimensions. Values larger than 1 lead to a compressed screen (screen dimension bigger than the dimension of
the output mode), and values less than 1 lead to a zoom in on the output. This option is actually a shortcut
version of the --transform option.

--scale-from wxh
Specifies the size in pixels of the area of the framebuffer to be displayed on this 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 value reported as physical size of the X screen as a whole (union of all configured monitors). In
configurations with multiple monitors with different DPIs, the value has no physical meaning, but it may be
used by some legacy clients which do not support RandR version 1.2 to compute a reference font scaling. Nor‐
mally, xrandr resets the reported physical size values to keep the DPI constant. This overrides that computa‐
tion. Default DPI value is 96.

--dpi dpi

--dpi from-output
This also sets the value reported as physical size of the X screen as a whole (union of all configured moni‐
tors). In configurations with multiple monitors with different DPIs, the value has no physical meaning, but it
may be used by some legacy clients which do not support RandR version 1.2 to compute a reference font scaling.
This option uses either the specified DPI value, or the DPI of the given output, to compute an appropriate
physical size using whatever pixel size will be set. Typical values are the default (96 DPI), the DPI of the
only monitor in single-monitor configurations, or the DPI of the primary monitor in multi-monitor configura‐
tions.

--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: clock hdisp hsyncstart hsyncend htotal vdisp vsync‐
start vsyncend vtotal flags. flags can be zero or more of +HSync, -HSync, +VSync, -VSync, Interlace, DoubleS‐
can, CSync, +CSync, -CSync. Several tools permit to compute the usual modeline from a height, width, and re‐
fresh 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 first 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 conve‐
nient 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) comma-separated list of
decimal or hexadecimal (with a leading 0x) values. 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. If
green and blue are not specified, the red value will be used for all three components. 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 sup‐
port 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.

X Version 11 xrandr 1.5.3 XRANDR(1)

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