apport information
** Tags added: apport-collected xenial
** Description changed:
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
** Attachment added: "AlsaInfo.txt"
https://bugs.launchpad.net/bugs/1467190/+attachment/4793643/+files/AlsaInfo.txt
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https://bugs.launchpad.net/bugs/1467190
Title:
No audio over DisplayPort MST
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