@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 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
