>> I can get the subwoofer to work with /etc/modprobe.d/alsa-base.conf using:
 options snd-hda-intel model=ref

>> But if I do that I, when I plug in a headphone the subwoofer stays on
(the normal speakers, however, are muted).

if node 0x0f is the internal speaker try model=ref and use hda-analyzer
to find out which output pin complex is the subwoofer

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https://bugs.launchpad.net/bugs/923250

Title:
  subwoofer and headphone won't play nicely on dv7

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