[ubuntu] 5.1 audio over HDMI

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http://ubuntuforums.org – Hello, running 12.10 amd64 on a ASUS M5A88-M Motherboard with a built in RS880 [Radeon HD 4250] graphics card. I've got a nice 5.1 surround sound AV receiver which only accepts HDMI, so I'm not interested in any other way to play audio other than HDMI. I've built a home theatre PC, so having the graphics on the MoBo cuts down on space, power and fan noise. I really can't fit a graphics card into the tiny, quite little box I've built. Stereo sound and display work great in ubuntu, but I cannot find anyway to get 5.1 audio playback of DVDs. Ubuntu sound settings only shows stereo configura (Hardware)