Usually bugs in the driver don't affect such different chipsets, but
this actually looks like a bug in mesa, and not in the driver. The error
comes from Mesa-7.2/src/mesa/drivers/dri/common/dri_bufmgr_fake.c in the
source package mesa (http://packages.ubuntu.com/source/intrepid/mesa).
It's line number 987 in
http://cgit.freedesktop.org/mesa/mesa/tree/src/mesa/drivers/dri/common/dri_bufmgr_fake.c?h=mesa_7_2_branch&id=75b8d0209c62e696714abf16782804c5a14159cf
.

There has been one update to this file after mesa 7.2 was released
(http://cgit.freedesktop.org/mesa/mesa/commit/?id=75b8d0209c62e696714abf16782804c5a14159cf)
fixing a bug http://bugs.freedesktop.org/show_bug.cgi?id=17705 , but I
don't know if that bug is related to this one.

** Summary changed:

- Programs that use graphics acceleration crash 855GM 
+ 3D programs crash withAssertion `target_fake->is_static || 
target_fake->size_accounted' failed

** Tags added: 965gm intrepid

-- 
3D programs crash withAssertion `target_fake->is_static || 
target_fake->size_accounted' failed
https://bugs.launchpad.net/bugs/296020
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