1. Please ensure all "linux-backports-modules-alsa-" packages are not installed 
(including "linux-backports-modules-alsa-karmic-generic" that I asked you to 
try previously).
2. Install the "crack of the day" alsa-driver from 
https://edge.launchpad.net/~ubuntu-audio-dev/+archive/ppa 
<https://edge.launchpad.net/%7Eubuntu-audio-dev/+archive/ppa> Also ensure that 
you install the "linux-alsa-driver-modules-2.6.31" package from that same 
repository.
3. Ensure there are no added “model quirks” in the file 
/etc/modprobe.d/alsa-base.conf (there would only be quirks in this file if you 
have edited it).
4. Do a complete shutdown, as a reboot does not seem to make these settings 
"stick".
5. Ensure that the correct channels are not muted using alsamixer (from a 
terminal window).
6. Do a complete shutdown, as a reboot does not seem to make these settings 
"stick".
If this does not resolve your issue,please run the command apport-collect -p 
alsa-base 511685 so that I am able to help you further diagnose this issue.
Thanks in advance!

** Changed in: ubuntu
   Importance: Undecided => Low

** Changed in: ubuntu
       Status: New => Incomplete

-- 
Motherboard audio does not disable when front panel is in use
https://bugs.launchpad.net/bugs/504020
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