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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:
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
* 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 :(
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
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
Date: Wed Apr 27 07:35:58 2016
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
UpgradeStatus: Upgraded to xenial on 2016-04-21 (5 days ago)
dmi.bios.version: GMET72WW (2.20 )
dmi.board.asset.tag: Not Available
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.version: Not Available
dmi.product.version: ThinkPad T540p
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