Thanks Raymond, I hope this information helps.

I took the time to test line in (microphone) capabilities as well and I
noticed that is failing as well in a similar fashion. I have updated the
bug report title and initial text to reflect that as well. Here are the
results:

### Not docked, no speakers connected
Pin 0x12 (Internal Mic): present = No
Pin 0x13 (Not connected): present = No
Pin 0x14 (Internal Speaker): present = No
Pin 0x15 (Black Headphone, Right side): present = No
Pin 0x16 (Not connected): present = No
Pin 0x17 (Not connected): present = No
Pin 0x18 (Not connected): present = No
Pin 0x19 (Not connected): present = No
Pin 0x1a (Black Mic, Right side): present = No
Pin 0x1b (Not connected): present = No
Pin 0x1d (Not connected): present = No
Pin 0x1e (Not connected): present = No

### Not docked, only speakers connected to laptop line in/line out combo port
Pin 0x12 (Internal Mic): present = No
Pin 0x13 (Not connected): present = No
Pin 0x14 (Internal Speaker): present = No
Pin 0x15 (Black Headphone, Right side): present = Yes
Pin 0x16 (Not connected): present = No
Pin 0x17 (Not connected): present = No
Pin 0x18 (Not connected): present = No
Pin 0x19 (Not connected): present = No
Pin 0x1a (Black Mic, Right side): present = No
Pin 0x1b (Not connected): present = No
Pin 0x1d (Not connected): present = No
Pin 0x1e (Not connected): present = No

### Not docked, In-Ear headphones connected to laptop line in/line out combo 
port
Pin 0x12 (Internal Mic): present = No
Pin 0x13 (Not connected): present = No
Pin 0x14 (Internal Speaker): present = No
Pin 0x15 (Black Headphone, Right side): present = Yes
Pin 0x16 (Not connected): present = No
Pin 0x17 (Not connected): present = No
Pin 0x18 (Not connected): present = No
Pin 0x19 (Not connected): present = No
Pin 0x1a (Black Mic, Right side): present = Yes
Pin 0x1b (Not connected): present = No
Pin 0x1d (Not connected): present = No
Pin 0x1e (Not connected): present = No

### Docked, no speakers connected
Pin 0x12 (Internal Mic): present = No
Pin 0x13 (Not connected): present = No
Pin 0x14 (Internal Speaker): present = No
Pin 0x15 (Black Headphone, Right side): present = No
Pin 0x16 (Not connected): present = No
Pin 0x17 (Not connected): present = No
Pin 0x18 (Not connected): present = No
Pin 0x19 (Not connected): present = No
Pin 0x1a (Black Mic, Right side): present = No
Pin 0x1b (Not connected): present = No
Pin 0x1d (Not connected): present = No
Pin 0x1e (Not connected): present = No

### Docked, speakers connected to the dock (line out)
Pin 0x12 (Internal Mic): present = No
Pin 0x13 (Not connected): present = No
Pin 0x14 (Internal Speaker): present = No
Pin 0x15 (Black Headphone, Right side): present = No
Pin 0x16 (Not connected): present = No
Pin 0x17 (Not connected): present = No
Pin 0x18 (Not connected): present = No
Pin 0x19 (Not connected): present = No
Pin 0x1a (Black Mic, Right side): present = No
Pin 0x1b (Not connected): present = Yes
Pin 0x1d (Not connected): present = No
Pin 0x1e (Not connected): present = No

### Docked, microphone connected to dock (line in)
Pin 0x12 (Internal Mic): present = No
Pin 0x13 (Not connected): present = No
Pin 0x14 (Internal Speaker): present = No
Pin 0x15 (Black Headphone, Right side): present = No
Pin 0x16 (Not connected): present = No
Pin 0x17 (Not connected): present = No
Pin 0x18 (Not connected): present = Yes
Pin 0x19 (Not connected): present = No
Pin 0x1a (Black Mic, Right side): present = No
Pin 0x1b (Not connected): present = No
Pin 0x1d (Not connected): present = No
Pin 0x1e (Not connected): present = No

** Summary changed:

- [HP EliteBook 840 G2, Realtek ALC3228, Black Headphone Out, Right] Headphone 
out on docking station doesn't work
+ [HP EliteBook 840 G2, Realtek ALC3228, HP UltraSlim Dock 2013] Line in/Line 
out on docking station doesn't work

** Description changed:

- When I plug in external speakers to "headphone out" 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.
+ 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
+  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

** Changed in: alsa-driver (Ubuntu)
       Status: New => Confirmed

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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

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