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SubjectGraphics on thinkpad x270 after dock/undock works only for the first time (CPU pipe B FIFO underrun)
When I dock my thinkpad x270 [1] and run xrandr --auto, image correctly 
appears on external display.

After undocking and docking again, the image on external display doesn't
appear any more, and this pops up in dmesg

[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

After restarting X (no need to reboot), I am able to dock again and get
image on external display.

I don't think this is a regression, I tried a few older kernels up to
something around 4.11, and nothing worked.

In case any more information is needed to debug this, please let me know,
I'll happily provide it.

Thanks,

--
Jiri Kosina
SUSE Labs

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