Try the latest update to the system image. You can download it from the wiki. Make sure its the Debian 7 beta image and not Debian 8.Then when that's done make sure audio is set to HDMI in the ALSA mixer if that's what you're using.I haven't tried analog audio yet and I'm not sure if it works. The wiki said that the jack is for a microphone though it could be turned into analog audio out (somehow).
11/18/14 at 2:11pm