I have the same problem. I use a freshly installed Ubuntu 12.04 64 bits, and when I log under unity (3d) the GUI freezes after some time randomly. It can be when I surf the web with firefox or when I read a pdf file in evince. The mouse still moves on the screen, but nothing happens when I click somewhere. The system goes on working, for example, the music in rythmbox does not stop. All I can do is to Ctrl-Alt-F1 and get a console.
I think the problem is due to compiz, as no problem occurs when I log under unity2d. My config: Dell E520, graphics : Radeon X1300 with the radeon free driver. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/987498 Title: Unity/compiz freeze but mouse still move To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/987498/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs