Re: USB runtime D3

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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my knowledge of Windows internals is out of date by at least 10 years.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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