Brightness control does not work on fedora 34, tried on all 5.15 kernels.
Laptop: ASUS Zenbook UM325, AMD Ryzen 5600U with integrated radeon.
Seems to be an amdgpu problem.
Brightness controls work after suspend/resume.
Value on /sys/class/backlight/amdgpu_bl0/actual_brightness shows value change but the brightness does not change.
Using it on zenbook um325 with AMD ryzen 5600u. Sleep/resume works way better now, much better than 5.14.15.
Brightness control working for the first time on fedora 34, tried on all 5.15.x kernels. Laptop: ASUS Zenbook UM325, AMD Ryzen 5600U with integrated radeon.