Have the same problem with my system (Dell OptiPlex GX520, Intel® Pentium(R) 4 CPU 3.00GHz × 2, Graphics Intel® 945G x86/MMX/SSE2, Ubuntu 12.04 LTS). After a clean boot all fine for a while then graphics start to go wonky. Background image gets pixellated once an app like Firefox is opened and then closed. Tool tips off the Unity Launchpad strip at the left are effected i.e. some don't display correctly. In some rare cases the entire system gets effected and the menu items, etc. can't be read and a restart is necessary.
Problems only started with the introduction of Unity. Before this the graphics worked perfectly. May be related but my system also seems much slower now than 10.10 or even 11.04. Really annoying bug that feed the Linux nay-saying machine. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/921871 Title: Screen frequently distorts randomly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/921871/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
