Attaching lsmod output. noapic and nolapic were one of my attempts to make the lockups go away, as were uninstalling usplash and linux- restricted-modules-2.6.17-10-generic, after reading bug 63413. I have rebooted without noapic and nolapic and will attach the files on the next lockup, if it stays true to form.
** Attachment added: "lsmod output" http://librarian.launchpad.net/5152320/lsmod.txt -- Sporadic 7-minute freeze and "BUG: soft lockup detected" https://launchpad.net/bugs/72816 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs