[Bug 198885] amdgpu.dc=1 on CIK (R4 Mullins APU) brightness impossible to change. by Fn or "echo".

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=198885

--- Comment #2 from Przemek (soprwa at gmail.com) ---
Hi Michel,

Thank you very much for insane-fast response.

Yes, "actual_brightness" is a bad example, same occurs on this file without
"amdgpu.dc=1".

Here are values from requested files:

"/sys/class/backlight/amdgpu_bl0 # cat brightness
3" 

"/sys/class/backlight/amdgpu_bl0 # cat max_brightness
255"

"/sys/class/backlight/amdgpu_bl0 # cat actual_brightness
3"

I have tried different values also:
"/sys/class/backlight/amdgpu_bl0 # echo 100 > brightness
bash: echo: błąd zapisu: Bad argument
/sys/class/backlight/amdgpu_bl0 # echo 50 > brightness
bash: echo: błąd zapisu: Bad argument
/sys/class/backlight/amdgpu_bl0 # echo 10 > brightness
bash: echo: błąd zapisu: Bad argument"

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