apport information

** Attachment added: "Lspci.txt"
   https://bugs.launchpad.net/bugs/1467190/+attachment/4793648/+files/Lspci.txt

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https://bugs.launchpad.net/bugs/1467190

Title:
  No audio over DisplayPort MST

Status in linux package in Ubuntu:
  Triaged

Bug description:
  I have a Lenovo ThinkPad E540 with an Intel Haswell (4th Gen) HD
  graphics controller connected to a OneLink Pro Dock. The Dock uses
  DisplayPort (DP) 1.2 MST (multi stream transport) to provide both a DP
  and a DVI port. My monitor is connected to the DP.

  When I used kernels <= 3.16 audio worked fine, but the monitor would
  flicker heavily. So I installed linux-lts-vivid (3.19) which fixed the
  graphics problem (now I can see various DP? outputs in xrandr as
  opposed to one before), but there is no DP audio output to chose
  anymore.

  I also tested the latest mainline kernel 4.1-rc8, where this bug still
  exists. To further investigate I got these version's kernel sources,
  applied 4 patches by Dave Airlie from the intel-gfx mailing list [1]
  and tested this build (4.1-rc8+), which fixed the problem! I can play
  sound over DP, the same way I can over HDMI or DP without MST.

  I hope it is possible to backport these changes!

  [1] haswell displayport MST audio support
      http://www.spinics.net/lists/intel-gfx/msg68973.html

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.19.0-22-generic 3.19.0-22.22~14.04.1
  ProcVersionSignature: Ubuntu 3.19.0-22.22~14.04.1-generic 3.19.8-ckt1
  Uname: Linux 3.19.0-22-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Jun 21 01:44:30 2015
  InstallationDate: Installed on 2014-01-06 (530 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 
(20131016.1)
  SourcePackage: linux-lts-vivid
  UpgradeStatus: Upgraded to trusty on 2014-06-12 (373 days ago)
  --- 
  ApportVersion: 2.20.1-0ubuntu2.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  stefan     2509 F.... pulseaudio
   /dev/snd/controlC1:  stefan     2509 F.... pulseaudio
   /dev/snd/controlC0:  stefan     2509 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=2ecc68b9-65e3-4cee-9b2a-d41ff651e4e8
  InstallationDate: Installed on 2014-01-06 (1077 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 
(20131016.1)
  MachineType: LENOVO 20C6S00200
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-57-generic.efi.signed 
root=/dev/mapper/ubuntuvg-root ro nogpumanager quiet splash pcie_aspm=force 
intel_pstate=enable
  ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-57-generic N/A
   linux-backports-modules-4.4.0-57-generic  N/A
   linux-firmware                            1.157.6
  Tags:  xenial
  Uname: Linux 4.4.0-57-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-12-15 (3 days ago)
  UserGroups: adm bumblebee cdrom dip lp lpadmin plugdev sambashare staff sudo 
vboxusers wireshark
  _MarkForUpload: True
  dmi.bios.date: 09/23/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: J9ET9EWW (2.24 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20C6S00200
  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.modalias: 
dmi:bvnLENOVO:bvrJ9ET9EWW(2.24):bd09/23/2016:svnLENOVO:pn20C6S00200:pvrThinkPadEdgeE540:rvnLENOVO:rn20C6S00200:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20C6S00200
  dmi.product.version: ThinkPad Edge E540
  dmi.sys.vendor: LENOVO

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