I've been struggling for several days with this issue. According to many posts the HP Spectre x360 works great with 16.10 and it does but this is the only problem i have (although a big one). Plugging in the headphones make speakers mute (ok) but no sound ever comes out from the headphones. I have Dual Boot with Windows 10 with Fast Startup disabled and headphone works ok in Windows (last Realtek drivers installed) so hardware problem is discarded.
Some more info The laptop detects when the jack is connected and disables speakers. I can "see the sound" in headphones section with pavucontrol and all seems right with alsamixer, no muted stuff Tried changes with hdaJackRetask, alsa-base.conf and alsa-mixer/paths/analog-output-headphones.conf but just trying my luck with those since it's not clear what should i change I also tried reinstalling alsa and pulseaudio
Any clues on this? I'm totally lost...
Update: this thread also has some info https://ubuntuforums.org/showthread.php?t=2354645&p=13615839#post13615839 it seems that new kernels don't seem to solve this issue for this particular Spectre model