Which Linux distro are you using? EndeavourOS
Which release version? Rolling release, last updated 2025-12-28
Which kernel are you using? 6.18.2-arch2-1
Which BIOS version are you using? 03.05
Which Framework Laptop 13 model are you using? (AMD Ryzen™ AI 300 Series, AMD Ryzen™ 7040 Series, Intel® Core™ Ultra Series 1, 13th Gen Intel® Core™ , 12th Gen Intel® Core™, 11th Gen Intel® Core™) AMD Ryzen AI 300 Series
Sometimes when I wake my Framework 13, the display will be dim even if I set the brightness to 100% in KDE, like there is a desync between 100% and the max nit level. Rebooting brings back the proper brightness control.
In this bugged state, the brightness values reported by the kernel is as follows:
$ ls -l /sys/class/backlight/*/*brightness
-r--r--r-- 1 root root 4096 Jan 2 15:06 /sys/class/backlight/amdgpu_bl1/actual_brightness
-rw-r--r-- 1 root root 4096 Jan 2 15:05 /sys/class/backlight/amdgpu_bl1/brightness
-r--r--r-- 1 root root 4096 Dec 29 13:32 /sys/class/backlight/amdgpu_bl1/max_brightness
$ cat /sys/class/backlight/*/*brightness
7967
19661
65535
And at 0%:
$ cat /sys/class/backlight/*/*brightness
0
1
65535
Issuing echo 65535 > /sys/class/backlight/amdgpu_bl1/brightness as the root user will allow the display to operate at full brightness, but changing the setting in KDE will drop it back down to 19661 again.