Hi, I have the same problems with audio on a MSI EX623X-077EU laptop. It
has the same audio circuits ( 82801I (ICH9 Family) HD Audio ). I managed
to make the front speakers (left and right) working. 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

and had to check "Headphone:" under volume control-->switches .

But the subwoofer is still not working :( . I miss the bass. This is the
only reason i dual boot with vista :(.

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