OK, seems that I have mixed up things a bit or the behavior is not 100%
reproducible. Actually, it looks like the following:

- the headset mic is recognized fine when connected to the docking station 
headset jack
- when connecting to the notebook's internal headset jack, I need to do the 
above trick (regardless if the notebook is docked or undocked)

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https://bugs.launchpad.net/bugs/1623804

Title:
  headset microphone is not recognized in headset-jack

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I'm using Ubuntu 16.04 on a Lenovo ThinkPad T450s. This notebook has a
  combined headphones/mic "headset"-jack as used by pretty much every
  smartphone nowadays.

  I have a Plantronics-Headset HW251/A - SupraPlus Monaural and a 4-pin
  3,5mm jack cable, made for use with PCs.

  When connecting the headset to the notebook, I get audio but the mic
  is not recognized.

  In contrast, when I boot Windows 7 on the same machine, the headset 
(including mic) works fine.
  Moreover, the headset works fine connected to an Apple MacBook Air.

  In contrast, I also have an Apple Earphones-Headset which came with an
  iPhone, this also works with the ThinkPad under Ubuntu.

  By saying "not recognized", I mean that in the audio settings of Ubuntu, when 
plugging in the Plantronics headset, no audio input "microphone" comes up and 
the internal mic of the notebook is still used. 
  --- 
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  buerger    2021 F.... pulseaudio
   /dev/snd/controlC1:  buerger    2021 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=21eeaf61-c437-45dc-80e3-e581eb6f795c
  InstallationDate: Installed on 2015-09-15 (366 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: LENOVO 20BX000XGE
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic 
root=UUID=93fc15f9-4090-40ff-a3ac-a642833f1da2 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-36-generic N/A
   linux-backports-modules-4.4.0-36-generic  N/A
   linux-firmware                            1.157.3
  Tags:  xenial
  Uname: Linux 4.4.0-36-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-04-22 (146 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers
  _MarkForUpload: True
  dmi.bios.date: 05/25/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET60WW (1.24 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BX000XGE
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrJBET60WW(1.24):bd05/25/2016:svnLENOVO:pn20BX000XGE:pvrThinkPadT450s:rvnLENOVO:rn20BX000XGE:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BX000XGE
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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