Same Problem seems to occur on my T480s with Thinkpad Ultra Docking
station and two external displays.
After booting and login, all displays work, but after executing:
# xrandr --output DP2-3 --rotate left
Display DP2-3 does not display anything any more, even though xrandr claims it
should:
#xrandr
Screen 0: minimum 320 x 200, current 5680 x 1920, maximum 8192 x 8192
[…]
DP2-3 connected 1200x1920+4480+0 left (normal left inverted right x axis y
axis) 518mm x 324mm
1920x1200 59.95*+
[…]
I'm running fully updated Ubuntu 18.10:
4.18.0-12-generic #13-Ubuntu SMP Wed Nov 14 15:17:05 UTC 2018 x86_64 x86_64
x86_64 GNU/Linux
** Attachment added: "dmesg"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1727662/+attachment/5218810/+files/dmesg
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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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