I have been experimenting the same problem, complete system lock up, for the last week (it happens randomly, about 10 minutes or so after log in). It was very stable up until last week, never had any problems with Ubuntu.
I updated the BIOS but it did nothing. However if you boot the kernel with the option acpi=off, the lock ups appear to stop (but the display resolution messes up) and this really is no solution. Setup: Intel Pentium 4 3.2Ghz Intel 945GTP Mother Board Ubuntu 12.04 LTS Kernel 3.2.0-34-generic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/993187 Title: ubuntu 12.04 completely freezes frequently. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/993187/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
