First test to run "speaker-test -c 6 -Dhw:0,0"
In my case I get the expected results (5.1 sound) when I do that.

A tips is to have the speaker test enabled as one plays with the mixer
settings.

I have created an asound.conf for just alc850.
It also upmixes the sound to 5.1 and allows multiple programs to use the 
soundcard at the same time.

Look at my post here:
http://ubuntuforums.org/showthread.php?p=4690673#post4690673

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sound problem with realtek alc850 on nforce4
https://bugs.launchpad.net/bugs/58832
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