[Bug 106006] Kernel 4.16.0+ switch amdgpu.dc=1 causes screen brightness set to 1 to be dimmed by default

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106006

--- Comment #4 from Joel Sass <sass.joel at gmail.com> ---
A fix I've found for the issue seems to be issueing an xrandr brightness
command to each monitor output.

EG: ~$ xrandr --output DP-5 --brightness .99

If brightness is set to 1, the monitor appears to lose some sort of rendering
characteristic, not necessarily brightness - It's like color rendering or gamma
correction change somehow. Simply changing the brightness a modicum seems to
fix the issue.

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