org.freedesktop.Hal.Device.LaptopPanel SetBrightness i brightness_value hal-system-lcd-set-brightness GetBrightness hal-system-lcd-get-brightness true laptop_panel MacBook Pro Laptop Panel custom 229 hald-addon-macbookpro-backlight light_sensor MacBook Pro Light Sensor 2 256 right left keyboard_backlight MacBook Pro Keyboard Backlight 256