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[Martin Pool <martinpool@xxxxxxxxx>]

I also tested pressing the hardware "prepare to eject" button near the
eject lever on the base.  That spins down my base's hdd, but it doesn't
affect the displays: the external one keeps working until I physically
remove the laptop.

After popping out the laptop, I see I can still move the mouse pointer
above the top of the laptop's screen, which suggests to me it thinks the
external display is still there, and that's why it has not moved the
windows.

However, interestingly, if I close and restart the monitors control
panel, it does notice that the external monitor has gone, and it then
shuffles the windows onto the internal screen.

When I reconnect the external monitor, it goes back to side-by-side mode
(not mirrored as scm experienced in lucid) and the windows that were on
the big monitor go back to it.

So, without jumping to conclusions, I think the problem is that X does
not notice the monitors were reconfigured when the machine is undocked.
I'm pretty sure Windows does notice, so it is physically possible.

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

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

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