Comment 23 for bug 548661

Same bug happens to me too on a fully-updated Lucid system. It was working fine on Karmic a few months ago, on the same system (the relevant sound was flagged as "[Conexant CX20582 (Pebble)]" by the bug-reporting tool, the system itself is a Toshiba Satellite T110-107). Plugging in the headphones makes no apparent difference to the sound, which continues to come out via the speakers but not the headphones.

This bug possibly happened on Karmic too, relatively recently; I didn't report it at the time because I wasn't sure whether it had happened or not, and because I'm not sure exactly what happened then. (This bug isn't an obvious one to check for unless you're specifically paying attention...)