Public bug reported:
$ xrandr --verbose | grep -iE '(gamma|bright)'
Gamma: 1.0:1.0:1.7
Brightness: 1.0
$ xrandr --output VGA1 --brightness .75
$ xrandr --verbose | grep -iE '(gamma|bright)'
Gamma: 1.0:1.0:1.0
Brightness: 0.75
As can be seen in the above command output, changing the brightness with
xrandr resets the gamma ratio to 1/1/1/ instead of 1/1/.6 (values in
xrandr --verbose output are inverted...)
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1444895
Title:
xrandr --brightness resets gamma ratio
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