Using nixos-unstable, after a recent upgrade graphical artifacts started appearing in wayland. This was solved by upgrading both firmware and changing kernel to use 6.13.
However after those changes, I cannot change the backlight anymore using brightnessctl or directly writing to amdbl1/brightness. Stuff like waybar or brightnessctl correctly detects the supposed brightness level and it changes with XF86 brightness keys, just that the actual brightness is always at max.
I tried changing kernel params to “acpi_backlight=none” “video”, “vendor”, “native” combined with “amdgpu.backlight=0” or not but none of them worked.
GPU is AMD Radeon 680M [Integrated].
Current kernel is 6.13 but downgrading to 6.11 did not help either