The distro you are using doesn't currently support that motherboard. The audio device should show up in lspci as device id 00:1b.0. To get audio support, you will need to download, build, and install alsa 1.0.11. I recommend getting the driver, libs, and utils. This should give you full audio support for your system (5.1 or 7.1, depending on the back panel port configuration).
One note, the speaker-test in 1.0.11 is currently broken, so it won't play in surround sound mode (-Dplug:surround51 option is broken).
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