Sorry, forgot about this. It seems that it was a problem with my motherboard. I upgraded my motherboard and it works now.
Thanks brendan -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/668939 Title: Display freezes at random -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
