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7th chunk of `xrandr.man`
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 the  crtc  currently  attached to this output.  If green and blue
              are not specified, the red value will be used for all three  com‐
              ponents.   Note  that  you  cannot  get  two different values for
              cloned outputs (i.e.: which share the same crtc) and that switch‐
              ing an output to another crtc doesn’t change the crtc gamma  cor‐
              rections 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 modifica‐
              tion, if your hardware has support to actually change the bright‐
              ness, 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 in‐
       teract 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 physi‐
       cally 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  cor‐
       rected 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 1.5.1                        XRANDR(1)
Title: xrandr: Gamma, Brightness, RandR 1.1 Options, and Examples
Summary
This section describes xrandr options for gamma correction and brightness adjustment. It details RandR version 1.1 options including setting screen size, refresh rate, orientation (rotation), and axis reflection. Several examples demonstrate how to use xrandr to configure multiple outputs, force specific modes, enable panning, scale displays, and apply keystone correction. It also lists related programs and the authors.