I have somewhat similar behavior on Lenovo T470p with external
displayport monitor connected via Thinkpad Ultra Dock on stock Ubuntu
17.04 (4.10.0-42-generic x86_64), but in my case it occurs after some
days of plugging in&out and ends with kernel panic (see screen photo).

** Attachment added: "kernelpanic.png"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1597267/+attachment/5028365/+files/kernelpanic.png

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https://bugs.launchpad.net/bugs/1597267

Title:
  ThinkPad X260 connecting external DisplayPort hangs system

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