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

After the issue happens, attach `journalctl -b -1` in next successful
boot.

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https://bugs.launchpad.net/bugs/1575334

Title:
Docking thinkpad laptop causes a complete system freeze

Status in linux package in Ubuntu:
Incomplete

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

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