Comment 5 for bug 542251

Upstream has tightened the agp dependency for i915 recently and it has not made it back to stable yet. The fix looks to be easily applied to lucid's kernel.

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1f7a6e372e9cb4d749f34c0738d832e6cadb4071