Same here on Intel 82G33/G31 on a dual screen setup (2 x 1440x900). Both
compiz and kwin are likely not able to display larger resolutions than
2048x2048 with OpenGL. -> Crash -> Really annoying. A workaround to have
some form of compositing enabled (transparency in widgets etc) is to use
metacity as default window-manager and enable compositing (default is
disabled) by executing :

"gconftool-2 -s '/apps/metacity/general/compositing_manager' --type bool
true"

A dual screen / large resolution screen setup will then work and you
have nice transparent widgets. Not perfect, but workable for now...

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https://bugs.launchpad.net/bugs/559883

Title:
  lucid X crashes with dual head configuration when opengl is enabled with 
intel GM945

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