(In reply to Arun Raghavan from comment #8)
> What needs to be done here? ALSA-side fix?


https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/893210

it is unlikely fix in alsa driver as pulseaudio expect jack detection
kctl

although js0 ST or js1 ST of ac97 register 0x72 of ad1981b may reflect
hp status


it is not clear how and when to check the change in jack state by timer or 
interrept

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https://bugs.launchpad.net/bugs/1078704

Title:
  headphone jack sense not enabled

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