I have the same issue with hd 5600 on 3.7.10 kernel on OpenSuse.
Try if using keyboard shortcut for "increase brightness" ( Fn- F5 on my dell laptop) does the trick to light up the display. It works sometimes for me.
I have the same issue with hd 5600 on 3.7.10 kernel on OpenSuse.
Try if using keyboard shortcut for "increase brightness" ( Fn- F5 on my dell laptop) does the trick to light up the display. It works sometimes for me.