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[Marc Olson <1666623@xxxxxxxxxxxxxxxxxx>]

I have seen similar behavior on a Lenovo X1 Carbon (4th Gen) running
Ubuntu 16.04, both directly attached, and through the OneLink+ dock.

I've "solved" this by disabling the internal display when I have an
external display attached, and only attaching a single external display.

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https://bugs.launchpad.net/bugs/1666623

Title:
  Windows disappear on disconnecting external monitor

Status in compiz-plugins-main package in Ubuntu:
  Confirmed

Bug description:
  When I undock my laptop and the external displays are disconnected,
  sometimes the windows which were on those displays end up on my
  laptop's internal display. This is useful.

  Often, however, they don't. I can still see them in the panel, and I
  can click on them to bring them back... but nothing happens. They are
  somewhere off-screen and I cannot find any way to recover those
  windows except to kill the application and restart it.

  Often when this happens, even redocking the laptop and bringing those
  displays back doesn't actually get the windows back — those monitors
  are empty when they come back, or have only a subset of the "missing"
  windows.

  This is an HP EliteBook 850 G3 running Ubuntu 16.04.

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