I found a work around by Peter Clifton. It's a patch to compiz. I'm using it, everything's ok.
http://osdir.com/ml/ubuntu-x/2009-01/msg00026.html -- DRI2: (UXA) white transparency artifacts with compiz https://bugs.launchpad.net/bugs/324854 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
