Screen

Managing screen backlight brightness

Discover your backlight device name:

ls /sys/class/backlight/

Get the current brightness (where amdgpu_bl1 is your backlight device name):

cat /sys/class/backlight/amdgpu_bl1/brightness

Get the max brightness:

cat /sys/class/backlight/amdgpu_bl1/max_brightness

Set brightness to 80%:

echo 51811 | sudo tee /sys/class/backlight/amdgpu_bl1/brightness   # ~80%

Note: Adaptive Backlight Management (ABM) (“vari-bright”) can sometimes dim the panel independently of this value.