Comment 5 for bug 349002

Aloha piovisqui!

What you describe sounds like an issue with KWin's desktop acceleration (i.e. graphics 3D bling). This can either be caused by a specific configuration that exposed an issue in your driver/X, or by driver/X being changed in a way that either triggered an issue within KWin, or that KWin exposed an issue within the X stack that was there all along. In any case it appears to be obvious that the X update is at fault here.

Still, there is the possibility that we need to add your chip/driver to the blacklist, so KWin will not even try to use desktop effects. So, my question for now is: did desktop effects work before (e.g. did your windows have a drop shadow and did you get a fancy animation when you switched across virtual desktops).

Thanks in advance and have a nice day :)