[Bug 30364] [945GME] poor 3d performance in deep c-states

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=30364

--- Comment #76 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to comment #75)
> We don't need to force fullscreen to cause us to loose vblank interrupts
> whilst the processor is asleep (and so render very slowly).

Oh right. Not sure where I got the idea that we wouldn't use vblank irqs unless
fullscreen.

After thinking about this for a while I started to question why we're frobbing
the AGPBUSY bit all the time. It won't force an exit from C3 unless there's a
pending interrupt, so we should just be able to leave it on all the time.

I pushed that idea here:
git://gitorious.org/vsyrjala/linux.git agpbusy2

I guess the chances of it working are slim, but migth as well try.

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