I am having the same issue on an Intel 945 Chipset (laptop), so it is
not just an Nvidia issue.
Steps attempted and results;
Enable Desktop-Effects with just one display enabled - WORKS (flawlessly)
Enable Desktop-Effects with both displays enabled - FAILS
Enable Desktop-Effects with both displays set to a resolution of 640x480 - FAILS
Enable second display and disable primary display - FAILS (fails to configure -
cannot get into X with these selection)
As a secondary note - i cannot set my second display as primary no
matter what.
I also noticed that if i run GLXgears it runs properly on the primary display
but if i drag it across to my second display the windows remains but the
rendered portion goes black (FPS stay the same there is no dip or rise in FPS).
If i then drag it back to the primary display the gears will be visible again.
Regards
Tom Anderson
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desktop-effects and dual-head are incompatible
https://bugs.launchpad.net/bugs/148352
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