> >>This leaves some unanswered questions. �On some buses (such as PCI or
> >>USB), it's not possible to access a device whenever its state is higher
> >>than 0.
>
> Not quite true. �PCI config space access is allowed, which is how
> things move from D1 to D2, or D2 to D3hot, etc. �And I suppose it'd
> make sense that CardBus, PCI Hotplug, and similar variants be able
> to "enter" D3cold ... e.g. by powering off the slot then removing the
> device. �That's the same thing USB can do with suspended devices:
> power off the hub port.
But that you can do only if the hub whose port you would power off
is awake. And higher up everything needs to be awake, too.
Regards
Oliver
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