I have problem with my HDA Intel PCH audio under Ubuntu 16.04. I never had any problem with speakers, however my microphone is not working.
When I plug microphone in jack, system reacts and it looks like microphone is in, however no single bar appear in any settings in "Input levels". The microphone works fine, just tested on notebook with Ubuntu 12.04.
Best Answer
I had this exact problem. My solution:
1) open PulseAudio control
2)go to the configuration tab.
3)select analog stereo duplex to use the computers built in audio&mic