The just-released ALSA 1.0.23 may help. From the changelog:
- ALSA: hda - Add Bass Speaker switch for HP dv7
The bass speaker is controlled via GPIO5.
Tested-by: Wael Nasreddine
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HP Pavilion DV7-1160eg with karmic poor Sound-Support (mute LED and Subwoofer)
https://bugs.launchpad.net/bugs/505252
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