Can't adjust screen brightness on Discrete Graphics

[JiaZhang]

See below

Lenovo Legion 5 - Can't change backlight/brightness

Issue I’ve just recently installed Manjaro with the KDE Plasma 5.20.5 desktop environment and I have come across the following issue: the brightness keys on my laptop (Lenovo Legion 5) don’t have any effect on the monitor’s backlight intensity. They still prompt the brightness slider icon and change the brightness value present in /sys/class/backlight/intel_backlight/actual_brightness. If I turn the brightness all the way down to 0 I just get a black screen. The laptop boots at max brightness b…

Can't adjust screen brightness (Lenovo Laptop, NVIDIA, XFCE)

This solution works, but sadly not with DRM enabled ( i.e. with the “nvidia-drm.modeset=1” kernel parameter), which is needed for a tear-free experience in KDE Plasma using the nvidia driver in my experience. Does anyone know why enabling DRM would remove the possibility of adjusting the backlight? Any fix?