Re: USB runtime D3

Alan Stern
2009-07-30T19:15:46Z

On Thu, 30 Jul 2009, Matthew Garrett wrote:

> On Thu, Jul 30, 2009 at 02:58:26PM -0400, Alan Stern wrote:
> > On Thu, 30 Jul 2009, Matthew Garrett wrote:
> >
> > > Yes, that would basically work for me. I'm still slightly curious as to
> > > why my hardware's not giving me the correct ACPI notification, though -
> > > I guess this may be entirely untested under Windows.
> >
> > To put it mildly...
>
> Windows doesn't D3 the host?

As far as I know, Windows doesn't even suspend the root hub. However
my knowledge of Windows internals is out of date by at least 10 years.
Thank goodness... :-)

Alan Stern

P.S.: Besides which, you can't put these Intel UHCI controllers into D3
because they don't support PCI PM. Controllers from other vendors
(i.e., VIA) do.

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