It looks like the new version of the sound drivers support something called "headphone jack sense". I had to "mute" that in the Gnome volume controls that for it to work. -- This is an email sent via the webforum on http://fcp.homelinux.org http://fcp.homelinux.org/modules/newbb/viewtopic.php?post_id=43886&topic_id=10343&forum=4#forumpost43886