I've same laptop and 16.04 with latest update. My alsa log file

I've the same issue. Sound working in laptop speaker. When I plugged in the 
headset, sometimes sound coming though both. I can configure in alsamixer. But 
That is not propper solution at all. And MICROPHONE NOT WORKING AT ALL.

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  external mic not detected on machines with alc256 codec

Status in HWE Next:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released

Bug description:
  This bug is used for tracking, please do not triage.

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