I was previously running Ubuntu Studio 12.10. When I first installed 12.10 I had no sound or playback. I fixed that problem by installing the GNOME alsa mixer.
I just finished upgrading to 13.04. Now my screen resolution is smaller (previously 1080p) with a black border surrounding it. I also have no audio playback. I have tried
I have a Zotac motherboard ITX series with built in Nvidia graphics using a HDMI output, 64 bit Intel Atom Ion processors, 4 GB RAM and a Corsair GT SSD.