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Ryan Budney
Asked: 2019-01-29 23:42:24 +0800 CST

After most recent kernel update (4.15.0-44-generic) my tablet freezes whenever plugged into docking station

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I performed the most recent kernel update on my Dell 5290 2-in-1 earlier today. But moments after I plug it into its docking station, the screen flickers, blanks and freezes. The only item left on the screen is the mouse pointer, and it is stuck.

If I leave the tablet not plugged in, it runs just fine. It seems to be the docking station that triggers the freeze.

That said, I can log into the tablet via ssh even with the screen frozen. So the system is still running. But if I try to reboot the tablet via the reboot command, nothing appears to happen. sudo reboot -f will reboot the system, while sudo reboot will not.

Any ideas where I should start looking to identify this problem?

tablet kernel dell 18.04 charging

3 Answers

  1. Same story here, using a XPS 15 99560 and a TB16 dock.

    The only solution found for now is to revert to 4.15.0-43, using the Advanced boot options in GRUB.

    Link to the kernel changelog. Link to the launchpad discussion where you can follow the evolution.

    EDIT : fixed in 4.15.0-45

    * External monitors does not work anymore 4.15.0-44 (LP: #1813663)
    - SAUCE: Revert "drm/i915/dp: Send DPCD ON for MST before phy_up"
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  2. Best Answer

    This problem has been solved in 4.15.0-45-generic. Running these commands can fix the issue:

    sudo apt-get update
sudo apt-get dist-upgrade
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  3. This kinda happens also to me, with my Surface Pro 3, when I boot it attached to the docking station.

    I can boot the device, but as soon as I log in, I get a kernel bug NULL pointer deference error. Which turns the display black and locks up all input. Network is still working though.

    If I boot the device and login without docking station, it works. I can attach the docking station afterwards.

    I've reported my issue here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813796

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