[Bug 203905] amdgpu:actual_brightness has unreal/wrong value

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203905

--- Comment #26 from Paulo Nascimento (paulo.ulusu at googlemail.com) ---
laptop: Lenovo Legion 5, amd ryzen 5 4600h
Graphics:  Device-1: NVIDIA TU116M [GeForce GTX 1660 Ti Mobile] driver: nouveau
           Device-2: Advanced Micro Devices [AMD/ATI] Renoir driver: amdgpu
Kernel 5.11.6-1
Manjaro 21.1

I have tried all suggested workarounds:
- systemctl start systemd-backlight at backlight:amdgpu_bl0

- mkinitcpio with MODULES=(amdgpu)

- acpi_backlight=vendor

- acpi_backlight=video

- /usr/lib/systemd/systemd-backlight save backlight:amdgpu_bl0
  /usr/lib/systemd/systemd-backlight load backlight:amdgpu_bl0

Even echo 10 >/sys/class/backlight/amdgpu_bl0/brightness doesn't change the
brightness.

Any suggestions?

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