I tried the HDMI output today on my new Lemur Ultra (I had not tried it before upgrading to 12.04). Picture was fine but no audio. I tried sound settings, but there was nothing obvious there to help. I found this addressed on the troubleshooting list on the System 76 support area, but it claimed that there would be a HDMI device listed under the output tab in sound settings. But I see no such devide -- only speakers and headphones. Is there some package I need to install? I did run the "restore" function in the System 76 Driver after upgrading.