Generally these types of issues should be analyzed as gnome-power-manager issues first, then driver issues if g-p-m can be ruled out.
It's possible g-p-m is simply not tracking your backlight settings correctly, or not updating them properly on reboot.
Generally these types of issues should be analyzed as gnome-power-manager issues first, then driver issues if g-p-m can be ruled out.
It's possible g-p-m is simply not tracking your backlight settings correctly, or not updating them properly on reboot.