@Paul David Johnson

Confirm this. 
Former intel graphic drivers supported a maximum framebuffer size from 
2048x2048. Since the new kernel based modesetting drivers were introduced the 
maximum framebuffer size is 4096x4096, witch is enough for my 3200x1600 (2x 
1600x1200) screen. So it doesn't wounder that the desktop effects and opengl 
didn't work with the old drivers, but why doesn't it work today, when the 
framebuffer is large enough? 
Are there any further hardware limitations? Can't believe this - the Microsoft 
driver works ...
Compositing itself is not the problem as switching from opengl (hardware 
redndering) to xrender (software rendering) leads to all the desktop effects 
working with dualhead setup - but a very, very slow system ...
My suggestion is to search a bug that effects the opengl system and the intel 
graphic driver. If I can help anyway please let me know!

PS: Bug still exists in kubuntu 10.04-rc and with the linux-
image-2.6.34-020634rc5-generic_2.6.34-020634rc5_i386 kernel.

-- 
lucid beta-2 X crashes with dual head configuration when opengl is enabled with 
intel GM945
https://bugs.launchpad.net/bugs/559883
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which is subscribed to xserver-xorg-video-intel in ubuntu.

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