Seeing this with a Lenovo T480.  Laptop display + USB-C dock with a
DisplayPort and HDMI out.  No issues with the HDMI connection, but the
DisplayPort connection is where I was having issues.  If the system
detected the Display Port monitor it came in as a disabled monitor.  If
I enabled it, then all screens would go blank and I would have to force
the laptop off to recover.  Currently booting back into 4.15.0-43
without issue.

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https://bugs.launchpad.net/bugs/1813663

Title:
  External monitors does not work anymore 4.15.0-44

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