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Situation
Xubuntu 16.04 after the automatic update of the kernel, from 4.4.0-31 to
4.4.0-34.
If I give a xrandr command that does not change the resolution or the output
monitor, but only the gamma and brightness
xrandr --output eDP1 --mode 1368x768 --rate 60 --gamma 1.25: 1.25: 1.25
--brightness 1:25
In eDP1 already 60 hertz and already 1368x768
Nothing is happening.
The change in brightness occurs if you change the resolution:
xrandr --output eDP1 --mode 1024x768
The screen is considerably brighter.
After the command:
xrandr --output eDP1 --mode 1024x768 --rate 60 --gamma 1: 1: 1
--brightness 1
Nothing happens, but the change of brightness occurs to the resolution
change.
for example
xrandr --output eDP1 --mode 1360x768
or
xrandr --output eDP1 --mode 1360x768 --rate 60 --gamma 1: 1: 1 --brightness 1
Loading the previous kernel 4.4.0-31 the brightness and gamma change
immediately.
Is my first report, I hope it is clear. Thank you.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: kernel xrandr
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Xrandr gamma and brightness problem on 4.4.0-34 kernel
https://bugs.launchpad.net/bugs/1613359
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