I too have this problem. Seems to happen at random times. I can't reproduce. I first thought that it was a heat issue but I ran some tests where I really loaded the system and run up the temps and nothing happened. No logs to see what happened. I've attached my sysinfo output.
** Attachment added: "sysinfo.txt" http://launchpadlibrarian.net/16421359/sysinfo.txt -- Hardy Freeze/Lockup with kernel 2.6.24-16-generic up to 2.6.24-19-generic https://bugs.launchpad.net/bugs/239021 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