It seems the plug/unplug the headset can't trigger the interrupt.
Please run $sudo hdajacksensetest -c 0 -a
Then plug the headset,
rerun the $sudo hdajacksensetest -c 0 -a
And upload the output of the above to launchpad.
BTW, does the internal microphone work on your machine?
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external mic not detected on machines with alc256 codec
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