I just discovered that this bug can be worked around by disabling the Composite extension in xorg.
-- Window redrawing does not work properly with KDE4 taskbar tooltips. https://bugs.launchpad.net/bugs/325074 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
