Sound out of headphones doesn't work sporadically.
Some applications, like audacity, will stop headphone audio from working at all even after restarting system or pulseaudio.

During this, sound over HDMI and speakers works fine.
Laptop is Del Inspiron 15 5000 series.

According to 'pactl list' my card is HDA Intel PCH ALC3246 Analog. Kernel module is snd_hda_intel.

I'm on mobile atm.