I also cannot get the subwoofer working on MSI EX625-227US, which has an
82801I (ICH9 Family) HD Audio Controller.  I had no sound at all until i
edited

 nano /etc/modprobe.d/alsa-base.conf

and added these lines at the end

 options snd-hda-intel model=3stack-dig
 options snd-hda-intel enable_msi=1
 options snd-hda-intel single_cmd=1

The speakers now work, but not the subwoofer.   I only see front speaker
volume adjustment.  This is my first time installing and using ubuntu, i
love it so far.  If i can provide more info please let me know.

-- 
Subwoofer doesn't work with HDA-Intel
https://bugs.launchpad.net/bugs/371048
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