Comment 7 for bug 396898

i did some tests
funnilly when doing dual screen with both screen at 800x600 (not clone mode) it worked
i modify the screen size on my netbook at 1024x600 and keep a resolution of 800x600 on the external screen and it worked to

then i had the idea to increase the external screen's resolution to 1024x768
and it bugs ... only the cursor was visible, both screen were black (no background, no icon, no window....)

when i increase the resolution even more, then X won't start, maybe because of the 2048x2048 limitation

what is funny, is that this limitation did not exist on windows or on mac os (yes i tried hackintosh)