When I plug in my headphones on Asus G751JT laptop with 16.04 LTS no sound is coming out of them while sound continues to play from laptop speakers.
Here are my Alsa details:
http://www.alsa-project.org/db/?f=6d358e8b683771d1ac039b8b9a09075c2bb61b84
Headphones work fine in preinstalled Windows 10.