IGEL OS 11.08.200 IGEL OS Articles Miscellaneous Current: How Do I Get My Fn Keys to Work? PDF Download PDF Download page How Do I Get My Fn Keys to Work?. Current page All pages How Do I Get My Fn Keys to Work? Brightness KeyIn the Profile Configurator or local Setup, enable System > Registry > x > xserver0 > handle_brightness_keys. (Registry key: x.xserver0.handle_brightness_keys)Confirm your changes with Ok or Apply. ×