Updating the intel X driver with the lasted version from ppa:ubuntu-x-swat/x-updates repository seem to solve the issue.
And also, the bug #662071 seem to be a duplicated of this bug. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/661910 Title: Kwin compositing problem on maverick -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs