Comment 8 for bug 820092

http://www.idt.com/products/audio-products/high-definition-hd-audio-codecs/stac9227-eight-channel-hd-audio-codec

The STAC9227/9228/9229/9230 are a family of Theater Quality 8-channel audio CODECs that enable systems with 7.1 audio or 5.1 audio playing simultaneously with VoIP or another stereo audio stream.

http://www.intel.com/support/motherboards/desktop/sb/CS-020642.htm#6ch

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

please post the output of alsa-info.sh

refer to Table 5. Pin Configuration Default Settings of stac9227 datasheet

the following pin complex should be Line Out instead of Speaker,

try model=3stack

Node 0x0d [Pin Complex] wcaps 0x400181: Stereo
  Pincap 0x0000173f: IN OUT HP Detect Trigger ImpSense
    Vref caps: HIZ 50 GRD 80
  Pin Default 0x01114010: [Jack] Speaker at Ext Rear
    Conn = 1/8, Color = Green
    DefAssociation = 0x1, Sequence = 0x0
  Pin-ctls: 0x40: OUT VREF_HIZ
  Unsolicited: tag=00, enabled=0
  Connection: 1
     0x02
Node 0x0e [Pin Complex] wcaps 0x400181: Stereo
  Pincap 0x00001737: IN OUT Detect Trigger ImpSense
    Vref caps: HIZ 50 GRD 80
  Pin Default 0x01119011: [Jack] Speaker at Ext Rear
    Conn = 1/8, Color = Pink
    DefAssociation = 0x1, Sequence = 0x1
  Pin-ctls: 0x40: OUT VREF_HIZ
  Unsolicited: tag=00, enabled=0
  Connection: 1
     0x04
Node 0x0f [Pin Complex] wcaps 0x400181: Stereo
  Pincap 0x00001737: IN OUT Detect Trigger ImpSense
    Vref caps: HIZ 50 GRD 80
  Pin Default 0x01113012: [Jack] Speaker at Ext Rear
    Conn = 1/8, Color = Blue
    DefAssociation = 0x1, Sequence = 0x2
  Pin-ctls: 0x40: OUT VREF_HIZ
  Unsolicited: tag=00, enabled=0
  Connection: 1
     0x05