apport information ** Attachment added: "Lspci.txt" https://bugs.launchpad.net/bugs/1467190/+attachment/4793648/+files/Lspci.txt
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1467190/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
