Thanks Luke.

I tried it but, sorry to report, the results are the same: pavucontrol
claims that the HDMI is unplugged.

I also checked with "aplay -D" commands and none of the HDMI devices
detected will play.  The internal audio and a USB device are detected
and work fine.

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Touch seeded packages, which is subscribed to pulseaudio in Ubuntu.

  No HDMI audio on Lenovo pro dock with T440s

Status in pulseaudio package in Ubuntu:

Bug description:
  pavucontrol shows Display Port/HDMI output as "(unplugged)" and cannot
  be chosen as a sink.  This is only a problem with the dock; audio
  works when plugging HDMI through the laptop's DP input.

  The audio did work with the dock in Ubuntu 14.04.  Did something in
  jack detection change?  Anyway, my work around is to plug a 3.4mm
  audio cable into the dock and power the speakers that way, but it
  would be nice to use the HDMI audio again.

  I would love to have a work around.  I've attached the output from, just in case this is useful.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: pulseaudio 1:8.0-0ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
   /dev/snd/controlC3:  weinberg   2221 F.... pulseaudio
   /dev/snd/controlC2:  weinberg   2221 F.... pulseaudio
   /dev/snd/controlC0:  weinberg   2221 F.... pulseaudio
   /dev/snd/controlC1:  weinberg   2221 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon May 16 17:18:06 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-05-06 (10 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
   PATH=(custom, no user)
  SourcePackage: pulseaudio
  UpgradeStatus: No upgrade log present (probably fresh install) 03/19/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET74WW (2.24 )
  dmi.board.asset.tag: Not Available 20ARA0S100
  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: Not Available
dmi:bvnLENOVO:bvrGJET74WW(2.24):bd03/19/2014:svnLENOVO:pn20ARA0S100:pvrThinkPadT440s:rvnLENOVO:rn20ARA0S100:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable: 20ARA0S100
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO

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