And there we have the bisect result:
>git bisect good a5872ca0a6f5e889d628b2946e550c7d0e892430 ddf6f9a4c9fb1c72ea2e8d196c9a580a8e914dbd is the first bad commit commit ddf6f9a4c9fb1c72ea2e8d196c9a580a8e914dbd Author: Dave Airlie <airl...@redhat.com> Date: Mon Dec 8 13:23:37 2014 +1000 drm/i915: resume MST after reading back hw state commit e7d6f7d708290da1b7c92f533444b042c79412e0 upstream. Otherwise the MST resume paths can hit DPMS paths which hit state checker paths, which hit WARN_ON, because the state checker is inconsistent with the hw. This fixes a bunch of WARN_ON's on resume after undocking. Signed-off-by: Dave Airlie <airl...@redhat.com> Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch> Signed-off-by: Jani Nikula <jani.nik...@intel.com> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> :040000 040000 692369dcf6b67c2b69d16bffeba828431067b128 99ccabef6d1cb9b5092025a4670a2e00e92b87a7 M drivers ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- 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/1454160 Title: External monitor is disabled after resume Status in linux package in Ubuntu: Confirmed Bug description: I have an external screen connected to my machine (T450s, via docking station) and after resuming from suspend, my external monitor is disabled. After some trial and error I made an interesting observation: The external monitor only stops working if suspend via systemctl suspend, sudo pm-suspend, or via the hotkey on my keyboard (K750). However, this problem does not occur if I suspend via the menu entry in the upper right corner. How is this even possible? Mapping the suspend command from the upper right corner to a hotkey would be a sufficient workaround. But which command is used by that button? ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: xorg 1:7.7+7ubuntu4 ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3 Uname: Linux 3.19.0-15-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.17.2-0ubuntu1 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Tue May 12 11:10:31 2015 DistUpgraded: Fresh install DistroCodename: vivid DistroVariant: ubuntu ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:5036] InstallationDate: Installed on 2015-05-03 (9 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) MachineType: LENOVO 20BWS03F00 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-15-generic root=/dev/mapper/vgubuntu-root ro quiet splash SourcePackage: xorg Symptom: display UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/10/2015 dmi.bios.vendor: LENOVO dmi.bios.version: JBET47WW (1.12 ) dmi.board.asset.tag: Not Available dmi.board.name: 20BWS03F00 dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrJBET47WW(1.12):bd03/10/2015:svnLENOVO:pn20BWS03F00:pvrThinkPadT450s:rvnLENOVO:rn20BWS03F00:rvrNotDefined:cvnLENOVO:ct10:cvrNone: dmi.product.name: 20BWS03F00 dmi.product.version: ThinkPad T450s dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.60-2 version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1 xserver.bootTime: Tue May 12 11:08:05 2015 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: xserver.version: 2:1.17.1-0ubuntu3 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1454160/+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