Adding "acpi=off" to the grub boot stanza for this kernel stops this from happening. See Bug #52649 .
-- Sound misfunctions with kernel 2.6.15-26-386 on Jetway MB https://launchpad.net/bugs/53207 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs