I am also observing this issue on a Thinkpad T470s using a Thinkpad
Ultra Type 40A2 dock.

** Attachment added: "kern.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1727662/+attachment/5110416/+files/kern.log

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https://bugs.launchpad.net/bugs/1727662

Title:
  [Lenovo ThinkPad T450s] Issues after docking and locking:
  [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A
  FIFO underrun

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