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[macolu <ubuntu@xxxxxxxxxx>]

Just ran apport-collect command above. Result is :"No additional
information collected."

** Package changed: linux (Ubuntu) => ubuntu

** Changed in: ubuntu
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1565924

Title:
  [Xenial] Freeze when docking Laptop

Status in Ubuntu:
  Confirmed

Bug description:
  Hi

  I just upgraded from Kubuntu 15.10 to 16.04, to see if crashes related
  to screen layout changes have been fixed in Plasma 5.5.

  I'm not sure whether the situation really improved. However, I
  experience a freeze when docking laptop. I didn't experience it on
  15.10.

  How to reproduce:
  * Start laptop docked. On the dock, I have two monitors (one HDMI, one VGA). I correctly see desktop on three monitors.
  * Undock laptop. Screen is correctly resized (however, Plasma stills crashes, but this is maybe off topic here)
  * Dock laptop again. Laptop is frozen.

  Freeze happen with default kernel linux-image-4.4.0-16-generic.
  However, I don't reproduce the freeze with linux-image-4.4.0-040400-generic (from kernel-ppa, installed before Xenial upgrade).

  Hardware is Dell Latitude E7450
  Integrated Graphics Chipset: Intel(R) HD Graphics 5500

  I tried to see content of various logs when freeze happen, but I
  didn't see anything relevant:

  tail -f /var/log/kern.log
  journalctl -f

  The issue is 100% reproducible, so I can provide more information if
  you tell me what to add :-)

  Thanks

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