Based on the recent FreeBSD patch and some older work by itohy@ I've
come up with

  http://www.perkin.org.uk/i915agp.diff

Please can people test that this works for their 915-based cards.  I'd
also like to know that this doesn't break agp support for older i810
cards.

(still doesn't fix X on my Lifebook S7020 but that's another story...)

Thanks,

-- 
Jonathan Perkin                                     The NetBSD Project
http://www.perkin.org.uk/                       http://www.netbsd.org/