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[Raymond <1505584@xxxxxxxxxxxxxxxxxx>]

http://www.intel.com/support/motherboards/desktop/sb/CS-034198.htm

Audio jack retasking is a feature that allows a jack to support more
than one function. For example, the pink audio jack can support
microphone input when the system configuration is set to stereo mode,
2-channel, and as Center/LFE or Rear Surround, when set to 6-channel
mode.

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https://bugs.launchpad.net/bugs/1505584

Title:
  [Realtek ALC887-VD] Playback only through 2 channels by default

Status in alsa-driver package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu does not detect my 5.1 surround sound[0] by default.  In order
  to get it detected, I have to do the following:

  1) Open alsamixer
  2) Change the "Channel Mode" setting from "2ch" to "6ch" (there is also a "4ch" setting)
  3) `pulseaudio -k`

  I have to do this on every boot, as the "6ch" setting is not
  remembered.

  
  [0] My soundcard and sound system are 5.1, but I actually only have front left, center, right and the subwoofer.  This shouldn't affect how Ubuntu acts at all (because it can't know what speakers I have plugged in to my subwoofer), but will mean that I can't report on whether or not rear channels are working as expected.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-30.34-generic 3.19.8-ckt6
  Uname: Linux 3.19.0-30-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  daniel    24007 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Oct 13 10:23:16 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-07-30 (439 days ago)
  InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Green Line Out, Rear
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: Only some of outputs are working
  Title: [MS-7788, Realtek ALC887-VD, Green Line Out, Rear] Playback problem
  UpgradeStatus: Upgraded to vivid on 2015-08-24 (49 days ago)
  dmi.bios.date: 01/18/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V2.3
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H61M-P31 (G3) (MS-7788)
  dmi.board.vendor: MSI
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV2.3:bd01/18/2012:svnMSI:pnMS-7788:pvr1.0:rvnMSI:rnH61M-P31(G3)(MS-7788):rvr1.0:cvnMSI:ct3:cvr1.0:
  dmi.product.name: MS-7788
  dmi.product.version: 1.0
  dmi.sys.vendor: MSI
  modified.conffile..etc.modprobe.d.alsa.base.conf: [modified]
  mtime.conffile..etc.modprobe.d.alsa.base.conf: 2015-08-05T11:15:16.899686

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