BUG: dualscreen + compiz + lucid = corruption on half of one monitor

[Sami Olmari]

Hello

I run 'ATI Technologies Inc M10 NT [FireGL Mobility T2] (rev 80)' with  
ubuntu lucid updated to latest + radeon drivers that cames with lucid.  
When I'm trying to use 2 monitors with compiz enabled, I get corruption in  
one half of one monitor. Without compiz I see no corruption. I'll attach 2  
screenshots to demonstrate.

  Sami Olmari
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