Hello, on my new Acer Nitro 5 (AN515-43-R8BF) backlight and actual_backlight value in sysfs mismatch. When backlight is 0 actual_backlight is still 5140.
root@nitro5:/sys/class/backlight/amdgpu_bl1# cat brightness 255 root@nitro5:/sys/class/backlight/amdgpu_bl1# cat actual_brightness 65535 root@nitro5:/sys/class/backlight/amdgpu_bl1# echo 0 >brightness root@nitro5:/sys/class/backlight/amdgpu_bl1# cat actual_brightness 5140 The laptop has a hybrid setup Picasso+Polaris11. 01:00.0 Display controller [0380]: Advanced Micro Devices, Inc. [AMD/ATI] Baffin [Radeon RX 460/560D / Pro 450/455/460/555/555X/560/560X] [1002:67ef] (rev c0) 05:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Picasso [1002:15d8] (rev c1) [ 4.594694] [drm] initializing kernel modesetting (POLARIS11 0x1002:0x67EF 0x1025:0x1367 0xC0). [ 4.866696] [drm] initializing kernel modesetting (RAVEN 0x1002:0x15D8 0x1025:0x1366 0xC1). Please let me know what other informations you may need. Best Regards, Gabriel C.