FYI as i just noticed it happens on the first and secondary screen with
the known error:

May 23 14:16:23 HOSTNAME kernel: [18314.479875]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun

** Summary changed:

- [Thinkpad T450s] Screen flickering on second monitor with docking station
+ [Thinkpad T450s] Screen flickering on external monitors with docking station

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https://bugs.launchpad.net/bugs/1572667

Title:
  [Thinkpad T450s] Screen flickering on external monitors with docking
  station

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