Confirmed on ThinkPad R50p, kernel 2.6.20-13-generic. Here also, a complete power-off is required to get sound back. Not even Windows can get it back on without a power-off.
-- [Feisty] Inaudible audio upon resuming from suspend-to-disk https://launchpad.net/bugs/80893 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
