This issue is FIXED with Linux kernel 5.16.0 (tested with liquorix
kernel).
Details: https://gitlab.freedesktop.org/drm/amd/-/issues/1671
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https://bugs.launchpad.net/bugs/1944094
Title:
Hey, look what I found!
https://gitlab.freedesktop.org/drm/amd/-/issues/1671 there is also
https://gitlab.freedesktop.org/drm/amd/-/issues/1438 which is the bug
report for the previous legion laptops, that one seems to center around
the 4000 series APUs, whereas this time it's centered around the 5
** Also affects: linux (Arch Linux)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1944094
Title:
Can't adjust screen backlight on Legion Slim 7 / Legion 5
Update to my previous comment - I've extensively tested different
configurations (mostly kernel parameters) on my Legion 5 15ach6. I did
manage to get the brightness to change when using just the dedicated GPU
(selected as such within the BIOS,) using the parameter
nvidia.NVreg_RegistryDwords=Enab
