There is a solution to get stereo working (at least on 6920G i can confirm this 
works) here:
http://ubuntu-virginia.ubuntuforums.org/showthread.php?t=852295
Though, setting the model to acer-aspire seems unnecessary, model=acer works 
just as well.
You can then turn on/off the "tuba" by turning on/off the "headphone" switch, 
very weird yes, but thats how it behaves for me..
Muting "Front" mutes the laptop speakers (including the tuba) so you can get 
audio out through your attached speakers only.

What still doesn't work:
-Surround (connecting 5.1 speakers to the laptop)
-Microphone

-- 
No sound on Acer Aspire 8920G with H.Heron 8.04 Beta x86_64 and Realtek ALC889 
and Intel HDA 82801H
https://bugs.launchpad.net/bugs/218165
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