Ubuntu
linux package

  1. Bug #1695989
  2. Comment #15

Comment 15 for bug 1695989

Revision history for this message
Alexander Kops (alexkops) wrote :

I upgraded to Ubuntu 17.10 and this bug started appearing (didn't have this with the versions before).
When I lock my screen on my Lenovo T450s and the notebook sits in the dock, one of the three things happen when I come back after some time and try to unlock:
* Most of the time the computer was just shut down and I have to restart it again
* Sometimes the main screen flickers weirdly and one of the two other screens show pixel garbage
* The main screen shows the lock screen but is completely frozen.
Occasionally unlocking also works.

The last thing I find in /var/log/syslog is
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

Note: Ubuntu uses kernel version 4.13.0-16-lowlatency for some reason, but the issue also appears when I boot with the generic version.