I believe this bug also affects me and a large number of other users across various video chipsets as discussed here: http://ubuntuforums.org/showthread.php?t=1743667.
On Dell Inspiron 9300, with ATI Radeon X300 chipset, and external monitor, I upgraded from 10.04 to 11.04, but then found that selecting resolutions higher than 1280x1024 on either or both screens resulted in repainting of the background failing and general X instability. This has the effect of leaving 'zombie' windows that have actually closed, but remain on screen and trails behind active windows when you move them. Logging out and back in using 'Ubuntu Classic (no effects)' overcomes this problem and no trails are left even at max res. GB. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/775994 Title: No Compiz in Ubuntu Classic 11.04 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs