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["G.M." <1444880@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

$ 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.

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  $ 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
+         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
+         Gamma:      1.0:1.0:1.7
+         Brightness: 1.0
+         Gamma:      1.0:1.0:1.7
+         Brightness: 1.0
  
- As you can see, "Gamma" values printed by xrandr --verbose are exactly
- 1/<value set>...
+ 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>...

** Description changed:

  $ 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>...
+ set>... Appart for value 1.0 which is correct.

-- 
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Packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1444880

Title:
  xrandr report inverted gamma values

Status in xorg package in Ubuntu:
  New

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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