Same problem on HP ProBook 650 G2 . The fix Gijs mentioned, doesn't work
on this model.

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https://bugs.launchpad.net/bugs/1470730

Title:
  [HP EliteBook 840 G2, Realtek ALC3228, HP UltraSlim Dock 2013] Line
  in/Line out on docking station doesn't work

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  When I plug in external speakers to line in/line out combo on the
  laptop the internal speakers are turned off but when I plug the
  speakers into the docking station (HP UltraSlim Dock 2013 EURO,
  D9Y32AA) music keeps playing in the internal speakers. Similar
  behaviour (nothing happens) is experienced with microphone connected
  to line in on docking station.

  ### Expected behaviour
  Plugging in external speakers to docking station should turn off sound from 
laptop internal speakers.

  Plugging in microphone to line in on docking station should switch
  from "internal microphone" to "microphone" in Ubuntu sound settings.

  ### Current behaviour
  Sound keeps playing in internal speakers when plugging in external speakers 
to docking station.

  Plugging in microphone to line in on docking station, nothing happens.

  ### Hardware
  Laptop: HP EliteBook 840 G2
  Product number: H9W19EA#AK8

  Docking station: HP UltraSlim Dock 2013 EURO
  Product number: D9Y32AA

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8
  Uname: Linux 3.19.0-21-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  chol       2001 F.... pulseaudio
   /dev/snd/controlC0:  chol       2001 F.... pulseaudio
   /dev/snd/controlC1:  chol       2001 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Jul  2 08:16:15 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-06-05 (26 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  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: Black Headphone Out, Right
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: Only some of outputs are working
  Title: [HP EliteBook 840 G2, Realtek ALC3228, Black Headphone Out, Right] 
Playback problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/24/2015
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: M71 Ver. 01.04
  dmi.board.name: 2216
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 96.54
  dmi.chassis.asset.tag: 5CG5093YZ7
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvrM71Ver.01.04:bd02/24/2015:svnHewlett-Packard:pnHPEliteBook840G2:pvrA3009D410303:rvnHewlett-Packard:rn2216:rvrKBCVersion96.54:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 840 G2
  dmi.product.version: A3009D410303
  dmi.sys.vendor: Hewlett-Packard

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