This behaviour persists with kernel 4.8.1

** Tags added: kernel-bug-exists-upstream

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  headset microphone is not recognized in headset-jack

Status in linux package in Ubuntu:

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
   /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
   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 05/25/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET60WW (1.24 )
  dmi.board.asset.tag: Not Available 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:bvnLENOVO:bvrJBET60WW(1.24):bd05/25/2016:svnLENOVO:pn20BX000XGE:pvrThinkPadT450s:rvnLENOVO:rn20BX000XGE:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone: 20BX000XGE
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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