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[Martin Pool <martinpool@xxxxxxxxx>]

I tested this on Natty with Unity (based on compiz).  (See also bug
745112 about an external monitor at all on natty.)

I set up two side-by-side screens, using an external monitor connecting
through the docking base and displayport.

I think undocked the laptop (without pressing the prepare-to-eject
button), and removed it.  I can see in the panel that the applications
are still running but their windows are all off the screen.  If I double
click on say Chrome, which has multiple windows open, I get the exposé
type view, but selecting one there does not bring it back on the screen.

By contrast if I turn the external monitor off in the control panel then
all the windows are shuffled to fit on the current screen.

I would speculate that when the machine is undocked, something lower in
the stack (X?) either doesn't notice this has happened, or doesn't send
a xrandr reconfiguration event, or compiz doesn't respond to it in the
same way it would handle a software-initiated reconfiguration.

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https://bugs.launchpad.net/bugs/733603

Title:
  Windows "lost" when switching from mirrored displays and back

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