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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