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[Bug 1575334] Re: Docking thinkpad laptop causes a complete system freeze


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:


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  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

  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
   /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
   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

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