Or try using the ATI 11.4 driver, there's seems to have been some issue's after that one regarding playback\lost hdmi handshake 
Or try using the ATI 11.4 driver, there's seems to have been some issue's after that one regarding playback\lost hdmi handshake![]()
I would first try the solution with setting the default resolution while not plugged in (then to your receiver). When hdmi handshake ist lost windows will change to the resolution you set when no TV is connected. If it is the same -> nothing changes.