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(Get the code!)
I have a similar problem on Asus Rog G751JT laptop.
When I connected headphones no sound is heard from them, but audio from speakers continues playing, there are no headphones in mixers, like they are not recognized at all, they work fine in Windows 10 and I tested with both of my headphones. When I add asus-mode hack in the alsa-base.conf I get sound from both speakers and headphones, but that is useless as speakers are not muted.
This is my Alsa:
http://
Ubuntu 16.04 LTS in question. Same behaviour is present in OpenSuse Tumbleweed I tested which has 4.6 kernel which could point to a wider Alsa bug.