Sounds like whatever was causing your setup to run in clone mode rather
than as an extended desktop was also fixed (that should have been an
issue caused by something other than -intel). However, libGL does not
support hw acceleration to surfaces larger than 2048 on 945gm and so all
the GL compositors fail miserably if you exceed that pixel count in any
dimension. -intel handles it by using different functions on the GPU
that can cope with the larger surfaces, or by splitting the operations
into small enough chunks for the 3D pipeline - so that it just works.

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https://bugs.launchpad.net/bugs/1135403

Title:
  xserver-xorg-video-intel regression (Intel 945GM) [xorg-edgers]

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