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[madbiologist <1443888@xxxxxxxxxxxxxxxxxx>]

This might be fixed in the upstream 3.19.5 kernel by this commit:

commit 3b9416495eb97b1471fab75c6586d8074a9d238c
Author: Sebastian Wicki
Date: Mon Mar 23 17:23:11 2015 +0100

    ALSA: hda - Add dock support for Thinkpad T450s (17aa:5036)
    
    commit 80b311d3118842eb681397233faa0d588df13f92 upstream.
    
    This model uses the same dock port as the previous generation.
    
    Signed-off-by: Sebastian Wicki
    Signed-off-by: Takashi Iwai
    Signed-off-by: Greg Kroah-Hartman

This kernel will eventually be incorporated into Ubuntu 15.04 "Vivid
Vervet".  Until then, a PPA of this kernel is available at
http://kernel.ubuntu.com/~kernel-ppa/mainline/ amd instructions on how
to install and uninstall it are available at
https://wiki.ubuntu.com/Kernel/MainlineBuilds

** Changed in: linux (Ubuntu)
       Status: Triaged => Fix Committed

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

Title:
  No sound on ThinkPad docking station

Status in linux package in Ubuntu:
  Fix Committed

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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