Comment 29 for bug 19711
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bbfa235
(Get the code!)
(In reply to comment #22)
> I don't think the chip should do that much bust mastering activity that it would
> prevent entering C3 when doing normal almost idle desktop drawing...
Actually, my reading of comment #19 is that bus mastering might quite easily
prevent C3. But there are too many unknowns.
> I suspect we might be hitting yet another issue here where the chip gets
> something wrong with the memory map and thus keeps trying to hit the bus
> instead of vram or AGP...
Possible, but even if that's the case, I'd be surprised if that would account
for significantly more bus mastering activity than the normal CP processing.
Anyway, bug 6939 comes to mind, e.g., might be interesting to try if Option
"RenderAccel" "off" makes a difference, although I'd expect that to affect MMIO
as well.