Article ID: 830957 - View products that this article applies to.
When you start or shut down your Microsoft Windows XP-based computer, either of the following behaviors may occur:
These behaviors may occur if all the following conditions are true:
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
To work around this behavior, delete the SelectiveSuspendEnabled REG-BINARY value from the Windows registry for your USB device.
To do this, follow these steps:
In Windows XP, USB can support the Selective Suspend feature. A driver that supports the Selective Suspend feature can turn off the USB device that it controls when the device becomes idle, even while the computer remains in a fully operational power state (S0).
For example, a driver can idle the host controller, empty USB hubs, and certain USB devices that the operating system supports. Selective suspend conserves battery power in laptop and Tablet PC computers. Typically, USB controllers use much battery power, even when no devices are attached to the computer.