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[Bug 1575334] Re: Docking thinkpad laptop causes a complete system freeze
Ugh - sorry about this, but I realise I've messed up. I assumed that
when you install a new kernel package it becomes the default kernel that
grub boots. I now know that's not the case.
I've gone back and re-tested all the mainline kernels: 4.2.0, 4.3.0,
4.4.0, and 4.6.0 all work perfectly with regards to this bug report. I'm
about to re-test the kernel from -proposed, just to make extra sure I
didn't mess up that result, and I'll update the bug tag accordingly.
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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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