Hello, there's a confusing idiom about "Backlight" and "Brightness". My english also not too good, please bare with me. Normally, in laptop screen, "Brightness" means how bright the Backlight lit up. But on Windows 8, "Brightness" did not change the backlight at all. It only changes the "image brightness". Increasing Brightness in Windows 8 = increasing brightness in image editor (picture become white). What's weird is that i can correctly changing the brightness (backlight) when Windows 8 still booting (blue windows logo). But as soon as i login, the brightness controll broken. It does not change the backlight, it change the image brightness. Any idea how to fix this? I have tried - disabling adaptive on power option - update friver do latest AMD, its now latest beta 13.10. Thanks for any replies.