https://bugs.kde.org/show_bug.cgi?id=449957

--- Comment #21 from phrxmd <philipp.reichm...@gmail.com> ---
Potentially important information: I can connect/disconnect the external
monitor *as long as there are no windows on it*. A Plasma panel seems to be
fine. However, as soon as there is an application window on the disconnected
output, I get this crash. 

In my regular work setup I would always have windows on the output because it's
my main monitor; I'm now testing this in a road warrior setting with a
projector, and here I can reproducibly crash KWin by putting a window on the
projector and then disconnecting it, while the projector disconnects just fine
as long as there is no window there. 

It seems like KWin tries to redraw the windows on the lost output by placing
them on the remaining outputs, and that the crash happens during the
recalculation of the placement coordinates. As long as there is nothing to
place, there is no crash.

(Subject line edited accordingly)

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