Comment 7 for bug 563161

 Distribution: Ubuntu 10.04
 Desktop environment: GNOME
 Graphics chip: ATI Technologies Inc RV350 AS [Radeon 9550]
 Driver in use: radeon
 Rendering method: AIGLX

Checking if it's possible to run Compiz on your system...

 Checking for texture_from_pixmap... [ OK ]
 Checking for non power of two support... [ OK ]
 Checking for composite extension... [ OK ]
 Checking for FBConfig... [ OK ]
 Checking for hardware/setup problems... [ OK ] (the first run it said something about the "non supported card", but don't remeber exacly what)

Everything is "OK" but the problem still there!