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6th chunk of `xrandr.man`
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 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 out‐
              puts 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  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,
Title: xrandr: Output Positioning, Properties, Gamma, Brightness, and RandR 1.1 Options
Summary
This section details xrandr options for positioning outputs relative to each other, setting output properties (integer, atom, string), disabling outputs, specifying the CRTC to use, adjusting gamma correction (red, green, blue), and modifying brightness. It also notes that the following options are for RandR version 1.1 and older, but still valid for newer X servers.