> Do you have a reference for the driver default change? Don't got exact reference on specific driver changes right now, cannot speak of an immediate regression but rather seems that kernels before 6.12 had erroneous behaviour according to https://wiki.archlinux.org/title/Backlight#Backlight_is_always_at_full_brightness_after_a_reboot_with_amdgpu_driver , which references https://bugzilla.kernel.org/show_bug.cgi?id=203905
Also just saw this https://wiki.archlinux.org/title/Backlight#Recent_(2025)_AMD_changes which addressed the changes for the brightness values post linux 6.15, will have to install the kernel from backports, check if the proposed patch handles post linux 6.15 brightness values as intended and report back.
