Recently, I installed Debian 9 Stretch (dual booting with windows 10 using grub). Everything works fine for now, except my headphones.
The PulseAudio 'Volume Control' interface detects my headphones fine.
So does running
alsamixer in the terminal. Even when I put on some music, the volume gage becomes active with a blue bar as if audio was coming through. But no sound coming through the headphones. I went back to windows 10 to definitively see if my 3.5mm jack on my laptop was the problem (or my headphones), and it works fine with windows 10.
It's a Debian.
PS. Sound works fine coming from my internal laptop speakers once I disconnect my headphones.