I have the same oops. Maybe the following helps to locate the problem. My laptop hangs during boot because 'modprobe sbs' hangs, i.e. the oops is caused by the sbs-module.
-- Kernel 2.6.20-13 acpi bug https://launchpad.net/bugs/96480 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
