In theory, to support 5.1

left headphone can be retasked as Front
middle line out can be retasked as Surround
mic jack can be retasked as Center/LFE

when only support stereo

left headphone and middle line out support two headphone
plug in any of the two headphone mute the internal speaker

unsolicited event need to enabled on line out jack

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https://bugs.launchpad.net/bugs/1195377

Title:
  [Inspiron 1420, SigmaTel STAC9228, Speaker, Internal] fails after a
  while or plug in and out headphones

Status in “alsa-driver” package in Ubuntu:
  New

Bug description:
  Regression from kernel 3.8.x to 3.9.x alsa drivers. After upgrade to
  Ubuntu+1 the internal speakers stop working randomly or when plug in
  and unplug headphones.

  Distributor ID: Ubuntu
  Description:    Ubuntu Saucy Salamander (development branch)
  Release:        13.10
  Codename:       saucy

  Linux zontar 3.8.0-26-generic #38-Ubuntu SMP Mon Jun 17 21:46:08 UTC 2013 
i686 i686 i686 GNU/Linux
  sudo python hda-analyzer.py
  # card-0/codec-0:data[2]=1 when headphone not been plugged, sound from spk
  # card-0/codec-0:data[2]=0 when headphone plugged, sound from hp
  # card-0/codec-0:data[2]=1 when headphone unplugged, sound from spk
  # card-0/codec-0:data[2]=0 when headphone plugged, sound from hp

  Linux zontar 3.10.0-0-generic #7-Ubuntu SMP Tue Jun 25 08:55:20 UTC 2013 i686 
i686 i686 GNU/Linux
  sudo python hda-analyzer.py
  # card-0/codec-0:data[2]=1 when headphone not been plugged, sound from spk
  # card-0/codec-0:data[2]=0 when headphone plugged, sound from hp
  # card-0/codec-0:data[2]=0 when headphone unplugged, silence from spk
  # card-0/codec-0:data[2]=0 when headphone plugged, sound from hp
  # card-0/codec-0:data[2]=0 when headphone unplugged, silence from spk

  Changing this data[2] setting in hda-analyzer does not appear to have
  any effect on kernel 3.10.0-0 running system. Must reboot to restore
  sound functioning on speakers.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.10.0-0.7-generic 3.10.0-rc7
  Uname: Linux 3.10.0-0-generic i686
  ApportVersion: 2.10.2-0ubuntu3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  es         2293 F.... pulseaudio
   /dev/snd/pcmC0D0p:   es         2293 F...m pulseaudio
  Date: Thu Jun 27 09:18:54 2013
  InstallationDate: Installed on 2012-10-07 (262 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta i386 (20120926)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Built-in Audio - HDA Intel
  Symptom_Jack: Speaker, Internal
  Symptom_Type: Sound works for a while, then breaks
  Title: [Inspiron 1420, SigmaTel STAC9228, Speaker, Internal] fails after a 
while
  UpgradeStatus: Upgraded to saucy on 2013-06-12 (15 days ago)
  dmi.bios.date: 12/19/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: 0DT492
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA10:bd12/19/2008:svnDellInc.:pnInspiron1420:pvr:rvnDellInc.:rn0DT492:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Inspiron 1420
  dmi.sys.vendor: Dell Inc.

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