Asus K56CM (ALC270) headphones problem

Some time ago I bought Asus K56CM. My OS chose was Windows 8 (I have MSDNAA license) for games and Ubuntu 12.10 for all other stuff. Up until today I have headphones issue under Ubuntu - sound was available on built-in speakers but headphones was completely silent. Yet, Ubuntu was aware that headphones were inserted and displayed proper information on settings window (speakers/headphones).

The resolution is to edit:

sudo gedit /etc/modprobe.d/alsa-base.conf

and add on the end:

options snd-hda-intel model=inv-dmic

Reboot afterwards and it works like a charm :)