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[Raymond <1518289@xxxxxxxxxxxxxxxxxx>]

as you disable auto mute, pulseaudio use front headphone jack to mute
line out jacks

http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths
/analog-output-headphones.conf mixer control 'Auto-Mute Mode',0
Capabilities: enum Items: 'Disabled' 'Enabled' Item0: 'Disabled'

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https://bugs.launchpad.net/bugs/1518289

Title:
  front headphone jack recognised by alsa but ignored by pulseaudio

Status in pulseaudio package in Ubuntu:
  New

Bug description:
  Summary:
  PC has 
  Card: HD-Audio Generic
  Chip: Realtek ALC887-VD
  Ubuntu 15.10 64-bit
  pulseaudio 1:6.0-0ubuntu13
  - working rear audio jack connected to speakers - volume controlled from Settings>Sound>Sound Output tab.
  - nonworking front headphone jack  - no corresponding output device in Settings>Sound>Sound Output tab.  (not affected by whether or not headphones are connected at boot time)
  However front headphone jack is visible (muted) in alsamixer, and volume can be unmuted and raised in current session - returns to muted on reboot.

  Detail:
  This desktop PC was previously running trusty with front headphone jack working normally - if audio on rear jack there was audio in headphones.  I do not remember now whether the audio volume was separately controlled as a second output device, either would have worked fine for me.
  Fresh install of wily on a new disk resulted in working rear audio jack, but non-working front headphone jack.
  The ubuntu Settings>Sound Output tab shows only one device for sound output: "Line Out - Built-in Audio".

  My expectation is that the volume level of the headphone jack should
  initially be set to a non-zero level.

  After exploring various options, I discovered that the front headphone
  jack is visible in alsamixer but displayed as level 0 and muted.  It
  can be made to work in the current session by unmuting and setting to
  a non-zero level.

  Adjusting volume and balance in the ubuntu Settings>Sound Output tab
  affects the audio output levels to the headphone jack in the way one
  might expect, but when the settings are changed while alsamixer is
  open (eg left right balance), the vertical bars for the headphone
  level do not move as they do for all other output jacks.  But when the
  surround sound profile is changed in the Settings>Sound Output tab,
  both actual headphone volume and headphone volume bars in alsamixer
  drop to 0 with muting.

  In any event, on reboot the jack is muted again and needs to be reset
  in alsamixer.

  Following online advice, I unsuccessfully tried various ways to make
  the unmuted settings survive a reboot - eg running alsamixer under
  sudo, alsactl store.

  Eventually I looked at the contents of the /var/lib/alsa/asound.state
  file and realised that the unmuted state was properly set in the file
  and was unchanged on reboot.

  The muting was being caused by pulseaudio.

  I was able to verify this by unmuting in alsamixer and restarting
  pulseaudio without rebooting - the output was muted again.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: pulseaudio 1:6.0-0ubuntu13
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jane       1189 F.... pulseaudio
                        jane       1491 F.... alsamixer
   /dev/snd/controlC0:  jane       1189 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Nov 20 20:26:26 2015
  InstallationDate: Installed on 2015-11-17 (2 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  ProcEnviron:
   LANGUAGE=en_AU:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  SourcePackage: pulseaudio
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/24/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V1.1
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: FM2-A75MA-E35 (MS-7721)
  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.:bvrV1.1:bd09/24/2012:svnMSI:pnMS-7721:pvr1.0:rvnMSI:rnFM2-A75MA-E35(MS-7721):rvr1.0:cvnMSI:ct3:cvr1.0:
  dmi.product.name: MS-7721
  dmi.product.version: 1.0
  dmi.sys.vendor: MSI

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