Does using e.g '/usr/lib/gnome-settings-daemon/gsd-backlight-helper --set-brightness 93' works at the time you get the issue? If not does it give you any error?
Does using e.g '/usr/lib/ gnome-settings- daemon/ gsd-backlight- helper --set-brightness 93' works at the time you get the issue? If not does it give you any error?