desertoak, I just attached an URL to the upstream bug report I filed in
the beginning of october. Since then Keith Packard have written a patch
for this bug and Eric Anholt improved and merged that patch. The bug was
in intel-agp.ko (a component inside the Linux kernel) and Eric's tree
has been pulled into Daniel Airlie's DRM tree which is turn has been
pulled by Linus Torvalds so it's very likely that this fix will be in
the 2.6.28 kernel.

That said, this still means that G45-based motherboards might not boot
on intrepid final unless someone from the ubuntu kernel team decides to
cherry pick this particular patch (see below). I'm not sure that's going
to happen though because we're beyond the "kernel freeze" in the
intrepid schedule (at least I've e-mailed them about it).

I suspect that the only change you need to make G45 work nicely is this one:
http://git.kernel.org/?p=linux/kernel/git/anholt/drm-intel.git;a=blobdiff;f=drivers/char/agp/intel-agp.c;h=f1fe7490131468b40c5817e232442026d9f8ff0d;hp=016fdf0623a4ce7b5f849efc8ab099a2c5026497;hb=2052746fc8397130c120f0194a89938b0b62b6cb;hpb=b34c87315b1a2822111fc8ef744ef504f9be2f85
Applying this change is indeed sufficient to fix my machine.

-- 
xorg hangs on startup (intel G45, compiz turned off)
https://bugs.launchpad.net/bugs/273708
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