apport information

** Attachment added: "ProcEnviron.txt"

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  X220 in dock doesn't mute external speakers when headphones connected

Status in alsa-driver package in Ubuntu:

Bug description:
  This worked in 14.04, and now "doesn't" in 16.04.

  Steps to reproduce:

  Have external speakers connected via the 3.5mm jack on the docking station 
and have the computer docked.
  Listen to some music.
  Notice that it's coming out of the external speakers.
  Plug headphones in to the 3.5mm jack on the laptop itself.
  Notice that music comes from the external speakers *and* the headphones.
  In the past the external speakers would have muted (I am 99% sure this is the 
case, but I will test with a live 14.04 image and report back) and the audio 
would have only come out of the headphones.

  I note that in the sound settings panel the external speakers are identified 
as "Headphones".
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC0:  will       4045 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-04-22 (152 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
  Package: alsa-driver (not installed)
  ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
  Tags:  xenial
  Uname: Linux 4.4.0-38-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo vboxusers
  _MarkForUpload: True 07/07/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET50WW (1.20 )
  dmi.board.asset.tag: Not Available 4287CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
dmi:bvnLENOVO:bvr8DET50WW(1.20):bd07/07/2011:svnLENOVO:pn4287CTO:pvrThinkPadX220:rvnLENOVO:rn4287CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: 4287CTO
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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