[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

Michel Dänzer (michel at daenzer.net) changed:

           What    |Removed                     |Added
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                 CC|                            |harry.wentland at amd.com

--- Comment #1 from Michel Dänzer (michel at daenzer.net) ---
(In reply to Przemek from comment #0)
> -r--r--r-- 1 root root 4096 02-22 13:41 actual_brightness
[...]
> "/sys/class/backlight/amdgpu_bl0 # echo 22 > actual_brightness
> bash: actual_brightness: permission denied"

As you can see above, this file is read-only.


> "/sys/class/backlight/amdgpu_bl0 # echo 128 > brightness
> bash: echo: błąd zapisu: Bad argument"

What does

 cat max_brightness

say? If it's a value smaller than 128, does writing a value <= that to the
brightness file work?


> Without "amdgpu.dc=1" in kernel command line changing brightness level is
> working as expected, both Fn keys, and echoing directly to a file.

What values do the brightness, max_brightness and actual_brightness files
contain in that case?

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