Re: Power consumption HZ250 vs. HZ1000

From: Pavel Machek
Date: Wed Jul 27 2005 - 03:03:16 EST


> > USB devices prevent entering C3 and any interesting powersaving,
> > try without USB...
> Why do USB devices prevent C3? If it was because of the timer polling
> in the root hub, I believe that should be fixed now.
> Or is there some other reason?

Yes. UHCI zas keeps doing DMA all the time.... It can be worked
around, but it means proper usb powermanagment support.
teflon -- maybe it is a trademark, but it should not be.
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