Were you using the nvidia driver? I recently observed a similar soft lock. The stack trace appears to come from the nvidia kernel module. Possibly related also to compiz. I have Intel CoreDuo in Dell D820 laptop.
dmesg output with stack trace attached. ** Attachment added: "dmesg ouput" http://launchpadlibrarian.net/13968249/softlock.txt -- Phenom kernel 2.6.24-8-server BUG: soft lockup - CPU#3 stuck for 11s! [events/3:18] https://bugs.launchpad.net/bugs/197252 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
