Please attach a full backtrace of the crash (see
http://wiki.ubuntu.com/X/Backtracing for directions).
Another thing to try with these sorts of "blank screen on mode change"
is to set the following in your xorg.conf and see if it makes the issue
go away:
Section "Device"
...
Option "ForceEnablePipeA" "true"
EndSection
If adding ForceEnablePipeA in xorg.conf does make the issue go away,
then refer to bug #138256, and report a new bug following the directions
there.
** Changed in: xorg (Ubuntu)
Status: Confirmed => Incomplete
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feisty logout crash
https://bugs.launchpad.net/bugs/86615
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