Dear Doron,

In the very beginning of my USB driver development I decided to
postpone power handler development and just forwarded any power IRP I
saw to USB bus driver. All power management functions were functioning
as usual. My notebook was able to go stand-by, hibernate and what ever
else power management actions Windows XP tried to undertake. I checked
the nature of IRPs, traveling down the stack. All of them were system
IRPs with corresponding information about system power state changes.
Being at the very top of USB stack, I never saw a single device power
IRP going down to USB bus driver on my device behalf, but the power to
my device was regulated exactly to the system-wide policy. My system is
Windows XP SP1/SP2.

According to your words, device will not transition between power
states if there is no power policy holder for it.

With best regards,
Vladimir S. Mirgorodsky



Doron Holan [MS] wrote:

your device didn't individually make a transition, it was turned off b/c the
HC was powered off. you didnt' see device power irps b/c you as the power
policy owner never sent them. Just b/c it happens to kinda, sorta, maybe
work doesn't mean you can ignore it.

d

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