Ubuntu
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  1. Bug #1727662
  2. Comment #54

Comment 54 for bug 1727662

Revision history for this message
Niklas Goerke (niklas974) wrote : Re: [Lenovo ThinkPad T450s] Issues after docking and locking: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

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