I have the same problem. It seems that if I type 'sudo reboot' on terminal, the system reboots as it should.
I also noticed that when this soft lockup occurs, some files get corrupted on my home partition. Firefox bookmarks and settings get corrupted every time because of this, and sometimes settings of other programs too. $ uname -a Linux ubuntu 2.6.17-7-generic #2 SMP Wed Sep 6 14:54:50 UTC 2006 x86_64 GNU/Linux -- BUG: soft lockup detected on CPU#0! https://launchpad.net/bugs/60053 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
