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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