Comment 32 for bug 1575078

I have the same issue. None of the solutions described above works for me (suspend/resume, Vart van Deenen's solution, "sudo alsa force-reload" or anything else). The settings in control center/sound detects that the headphones are plugged in, but sound comes out of them.

Sound from speakers work fine, also headphones with USB DAC/amplifier works.

Laptop Dell XPS 9550
Unbuntu Gnome 16.10
BIOS 1.2.19

uname -a
Linux elefant 4.8.0-39-generic #42-Ubuntu SMP Mon Feb 20 11:47:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux