(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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https://bugs.launchpad.net/bugs/1087582

Title:
  [gen3] Bad GPU performance whilst CPU is in deep sleep

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