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Screen brightness not changing in Thinkpad T14 Gen 2 AMD

cn flag

I purchased Thinkpad T14 Gen2 (AMD Ryzen Pro 5850), I have installed Ubuntu 20.04 with kernel 5.11.0 (as provided by ubuntu).

My screen is constantly at full brightness and the neither F5/F6 nor other system controls (like writing directly to /sys/class/backlight/amdgpu_bl0/brightness) seem to have any effect.

I have already tried removing thinkpad_acpi (modprobe -r thinkpad_acpi) and booting with kernel parameters acpi_backlight=vendor (as outlined here). But no avail.

I think the problem is more related to ACPI_VIDEO as suggested here and here, but I do not know how to proceed.

Can anyone please tell me the Ubuntu equivalent of the solutions proposed?

ipcamit avatar
cn flag
I just found out this tool which does work for me (https://github.com/LordAmit/Brightness). It is not ideal but it works!
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