Comment 4 for bug 995169

use 6stack or 6stack-dig if you want vmaster include headphone

In /etc/modprobe.d/alsa-base.conf

options snd-hda-intel model=6stack-dig

http://www.intel.com/support/motherboards/desktop/sb/cs-020642.htm#multistream

ad1988 and x1989 is a HDA codec with 10 channels DAC which support 7.1 + 2

The auto model allow you to play stereo to front panel headphone while playing 7.1 to rear panel jacks so the vmaster does not control the headphone volume

**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: AD198x Digital [AD198x Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 2: AD198x Headphone [AD198x Headphone]
  Subdevices: 1/1
  Subdevice #0: subdevice #0