A bug report was filed in 2010, supposedly fixed in 2018 and patched in
2019 in `xrandr` version `1.5.1`. I tried compiling `1.5.1` in Ubuntu
but it didn't seem to have been fixed yet. Documented in this Ask Ubuntu
Q&A: [When will xrandr version 1.5.1 be available in

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  xrandr report inverted gamma values

Status in xorg package in Ubuntu:

Bug description:
  $ xrandr --output VGA1  --gamma 1:1:1.7
  $ xrandr --verbose | grep -iE '(gamma|bright)'
          Gamma:      1.0:1.0:1.7
          Brightness: 1.0
          Gamma:      1.0:1.0:0.59
          Brightness: 1.0
  $ xrandr --output VGA1  --gamma 1:1:.6
  $ xrandr --verbose | grep -iE '(gamma|bright)'
          Gamma:      1.0:1.0:1.7
          Brightness: 1.0
          Gamma:      1.0:1.0:1.7
          Brightness: 1.0

  As you can see in output of commands above, "Gamma" values printed by
  xrandr --verbose are exactly the invert of the values set: 1/<value
  set>... Appart for value 1.0 which is correct.

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