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Screen scrambles when logon screen shows [duplicate]

Possible Duplicate: Strange Glitched Screen on Startup I run dual boot win7/Ubuntu 12.04 and my annoying problem is that every time the logon screen shows, my screen gets scrambled. This is ...
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GNOME Shell flickering with ATI proprietary drivers

Works fine with opensource drivers, but with catalyst flickers everytime you press on activities or the lower right bar. I have 01:00.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon ...