Power Policy Ownership in Serial Driver

NTDEV
1

I’m looking for a usb/serial dongle that can give up power policy ownership.
The inbox serial.sys honors a registry setting called SerialRelinquishPowerPolicy.

Also if there is an article that explains what goes wrong when two modules in a stack are power policy owners, I’m interested.

thanks,
m navab

2

massoud navab wrote:

I’m looking for a usb/serial dongle that can give up power
policy ownership.

Why? What are you trying to do?

3

I don’t think there is a doc or article that talks about 2 power policy owners in a stack, but the typical problems are

  1. deadlocks
  2. untested code paths
  3. undefined and unpredictable behavior b/c assumptions in one driver are being broken by another

d

-----Original Message-----
From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of xxxxx@yahoo.com
Sent: Wednesday, November 11, 2009 9:53 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] Power Policy Ownership in Serial Driver

I’m looking for a usb/serial dongle that can give up power policy ownership.
The inbox serial.sys honors a registry setting called SerialRelinquishPowerPolicy.

Also if there is an article that explains what goes wrong when two modules in a stack are power policy owners, I’m interested.

thanks,
m navab

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4

Thanks Doran. I notice that resume from sleep or hibernation fail on dongles. They work on standard ports.

Chris, I’m in a hid stack. Hid has to be the power policy owner. Hid assumes usb transport, but this is not always true.

5

HIDclass assumes nothing about the underlying transport. What it does assume is that it is the PPO. That has nothing to do with the transport, it is a normal assumption to make as the FDO for the stack

d

-----Original Message-----
From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of xxxxx@yahoo.com
Sent: Wednesday, November 11, 2009 1:02 PM
To: Windows System Software Devs Interest List
Subject: RE:[ntdev] Power Policy Ownership in Serial Driver

Thanks Doran. I notice that resume from sleep or hibernation fail on dongles. They work on standard ports.

Chris, I’m in a hid stack. Hid has to be the power policy owner. Hid assumes usb transport, but this is not always true.

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To unsubscribe, visit the List Server section of OSR Online at http://www.osronline.com/page.cfm?name=ListServer