Since this bug does not exist with any of the upstream kernels, it may be due to a SAUCE patch. Can you test the following Ubuntu kernels:
4.3.0-0.9: https://launchpad.net/ubuntu/+source/linux/4.3.0-0.9/+build/8360668 4.4.0-1.15: https://launchpad.net/ubuntu/+source/linux/4.4.0-1.15/+build/8880824 -- 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/1575334 Title: Docking thinkpad laptop causes a complete system freeze Status in linux package in Ubuntu: In Progress Bug description: Since upgrading to Xenial, about 80% of the time when I dock my thinkpad laptop I get a complete system freeze. The symptoms of the freeze are: * The two external monitors connected to the dock seem to be in a half-configured state - they're powered on, and display some graphics from my desktop, but do not yet show the correct contents. * I can't get to a console with Ctrl+Alt+F1. * I can't kill X with Ctrl+Alt+Backspace * I can't get the mouse cursor to appear or move, either with the trackpad or the external mouse. * Undocking the laptop doesn't help. The only thing I *can* do at this point is to hold down the power button. I seem to recall similar issues in the past (perhaps in Vivid?), where the fix ended up being in the graphics driver. The laptop is a T540p. The docking station is an "ultra dock pro" - not a USB dock, but rather one of those ones where the laoptop clicks into a base. This bug makes the docking station rather useless, and makes me sad :( ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-21-generic 4.4.0-21.37 ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6 Uname: Linux 4.4.0-21-generic x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: thomi 3196 F.... pulseaudio /dev/snd/controlC0: thomi 3196 F.... pulseaudio /dev/snd/controlC1: thomi 3196 F.... pulseaudio CurrentDesktop: Unity Date: Wed Apr 27 07:35:58 2016 HibernationDevice: RESUME=UUID=d27c9b15-955a-4bff-b4a7-e6116a8b30bb InstallationDate: Installed on 2015-10-12 (197 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: LENOVO 20BECTO1WW ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-21-generic N/A linux-backports-modules-4.4.0-21-generic N/A linux-firmware 1.157 SourcePackage: linux UpgradeStatus: Upgraded to xenial on 2016-04-21 (5 days ago) dmi.bios.date: 09/01/2015 dmi.bios.vendor: LENOVO dmi.bios.version: GMET72WW (2.20 ) dmi.board.asset.tag: Not Available dmi.board.name: 20BECTO1WW dmi.board.vendor: LENOVO dmi.board.version: SDK0J40709 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrGMET72WW(2.20):bd09/01/2015:svnLENOVO:pn20BECTO1WW:pvrThinkPadT540p:rvnLENOVO:rn20BECTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 20BECTO1WW dmi.product.version: ThinkPad T540p dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1575334/+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
