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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.


Jiri Kosina

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