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[Dan Gillmor <1443888@xxxxxxxxxxxxxxxxxx>]

Had the same problem with a T440s...

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https://bugs.launchpad.net/bugs/1443888

Title:
  No sound on ThinkPad docking station

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have a Thinkpad T450s. The sound works normally unless it is plugged
  in to the docking station (a ThinkPad Ultra Dock). If speakers are
  plugged in to the dock, the internal speakers get disabled correctly,
  but the output of the docking station does not work. Speakers which
  are plugged in directly on the Laptop still work.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-13-generic 3.19.0-13.13
  ProcVersionSignature: Ubuntu 3.19.0-13.13-generic 3.19.3
  Uname: Linux 3.19.0-13-generic x86_64
  ApportVersion: 2.17-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  daniel     1739 F.... pulseaudio
   /dev/snd/controlC1:  daniel     1739 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Apr 14 12:58:35 2015
  HibernationDevice: RESUME=UUID=a67a91aa-8c15-4693-be37-7c177747bc39
  InstallationDate: Installed on 2015-04-04 (9 days ago)
  InstallationMedia: It
  MachineType: LENOVO 20BWS03E00
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-13-generic root=UUID=1643390a-82a8-405a-b938-057879ff3c9c ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-13-generic N/A
   linux-backports-modules-3.19.0-13-generic  N/A
   linux-firmware                             1.143
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-04-04 (9 days ago)
  dmi.bios.date: 12/23/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET41WW (1.06 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BWS03E00
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrJBET41WW(1.06):bd12/23/2014:svnLENOVO:pn20BWS03E00:pvrThinkPadT450s:rvnLENOVO:rn20BWS03E00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BWS03E00
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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