>> I read elsewhere that the subwoofer is controlled by GPI0 5 - I don't know 
>> how to translate that into a usable options parameter, though.

there are only three gpio

GPIO: io=3, o=0, i=0, unsolicited=1, wake=1
   IO[0]: enable=1, dir=1, wake=0, sticky=0, data=0, unsol=0
   IO[1]: enable=0, dir=0, wake=0, sticky=0, data=0, unsol=0
   IO[2]: enable=0, dir=0, wake=0, sticky=0, data=0, unsol=0

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

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

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