xrandr






xrandr − primitive command line interface to RandR extension

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/border_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]

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
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.










                             ‐2‐


−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.




     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,









                             ‐3‐


     x, y are in pixels and mmw, mmh are the physical
     dimensions of the monitor.

−−delmonitor name
     Delete the given user‐defined monitor.




     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
     disconnected 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.




     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









                             ‐4‐


     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 of
          the output pixel is extended to 3 values 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 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
     ’bilinear’ 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









                             ‐5‐


     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.


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.
     Normally, xrandr resets the reported physical size
     values to keep the DPI constant.  This overrides that
     computation. 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
     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. 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









                             ‐6‐


     configurations, or the DPI of the primary monitor in
     multi‐monitor configurations.

−−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
     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 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









                             ‐7‐


     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) 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.











                             ‐8‐


−−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.


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.

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










                             ‐9‐


     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

Xrandr(3), cvt(1), xkeystone(1), xbacklight(1)

Keith Packard, Open Source Technology Center, Intel
Corporation.  and Jim Gettys, Cambridge Research Laboratory,
HP Labs, HP.