It sounds like the bug exists in the 4.2 final kernel, but it does not exists in Wily. That may indicated the bug existed in early versions of Wily, but was fixed in later versions.
Can you next test the latest upstream 4.2 stable kernel? It can be downloaded from: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.2.8-ckt8-wily/ -- 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
