Audio over HDMI issues

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http://ubuntuforums.org – Hello! I hope someone here will be able to help! I'm having a problem with audio over HDMI with mythbuntu 12.04 64bit and only stereo sound works. I decided to build a new machine so I've only been working with this a few days and this is all new to me. My Setup: * MSI z77ma-g45 mobo with: HDMI out, core i3 cpu with integrated HD4000 graphics, and realtek ALC892 sound on board. (no add-on cards) * updated my bios as another thread suggested with no change * HTPC connected via HDMI to my AV Receiver then to my HDtv * HDhomerun Prime tuner * mythbuntu 12.04 installed, then selected th (Hardware)