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[Anonymous <747769@xxxxxxxxxxxxxxxxxx>]

Probably the same as
https://bugs.launchpad.net/ubuntu/+source/dosbox/+bug/778290

I'm having the same problem. Dosbox wasn't upgraded when I upgraded from
Maverick to Natty and I never had this problem in Maverick.

To get this problem, Dosbox must be started in windowed mode. That is,
you must not use the "-fullscreen" flag and the "fullscreen" setting in
the "sdl" part of dosbox.conf must be set to "false". If Dosbox is
started in windowed mode, I am able to change between windowed and
fullscreen modes whenever I want.

If Dosbox is started in windowed mode, the resolution is set to the one
used by Dosbox, but instead of seeing Dosbox, I see the upper left part
of what I used to see. Pressing Alt-Enter to go back to windowed mode
does change the resultion, but the image is frozen. When I move the
mouse, the mouse cursor moves, but nothing else happens regardless of
what I do. Ctrl-Alt-Enter does not restart X. Ctrl-Alt-F1 works, so I
can reboot from TTY. Killing Dosbox from the TTY doesn't fix X; I still
have to reboot to fix the problems.

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https://bugs.launchpad.net/bugs/747769

Title:
  [Natty Beta1] Frozen screen after exiting fullscreen mode of e.g.
  dosbox