Comment 25 for bug 1467190

 @Ray-Ven I don't have the files lying around anymore. I will try to do it
again sometime. But until I get to it, you could really do it yourself if
you have a little experience with the terminal. I used git as per the
instructions on e.g. http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9/.
Using git apply you can also apply the patches from
http://www.spinics.net/lists/intel-gfx/msg68973.html

Ray-Ven <email address hidden> schrieb am Sa., 14. Jan. 2017 um
23:59 Uhr:

> @Totally King, is it possible you let me try your patched kernel with my
> hardware? I'm not able to apply the patches and everything.
> I'd like to see if my bugreport is a duplicate of yours.
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1310594
>
> Thank you
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> 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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