Comment # 11 on bug 1217750 from varval761

Created attachment 874096 [details]
Output of "hwinfo" for Lenovo 16ARH7 (without setting acpi_backlight)

I realized my previous hwinfo was with acpi_backlight=native, so here's the
hwinfo without setting any acpi_backlight kernel parameter, just in case it
could be useful.

Without setting acpi_backlight, "echo 100 >
/sys/class/backlight/nvidia_wmi_ec_backlight/brightness" gives an invalid
argument error.

With acpi_backlight=native, "echo 100 >
/sys/class/backlight/amdgpu_bl2/brightness" does change the brightness. The
brightness keys and sliders in KDE also work (as I mentioned before).