Microsoft KB Archive/923943

= A Windows Vista-based portable computer unexpectedly resumes from a sleep state when you disconnect the computer from a docking station =

Article ID: 923943

Article Last Modified on 11/13/2006

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APPLIES TO


 * Windows Vista Business
 * Windows Vista Enterprise
 * Windows Vista Home Basic
 * Windows Vista Home Premium
 * Windows Vista Ultimate

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SYMPTOMS
When you disconnect a Microsoft Windows Vista-based portable computer from a docking station, the computer unexpectedly resumes from a sleep state.



CAUSE
This issue occurs when one of the following conditions is true:
 * The computer has a USB Universal Host Controller Interface (UHCI) root hub.
 * A USB 1.1 device is connected to a port on the USB UHCI root hub. The USB 1.1 device may be connected to any USB hub that is connected to the port on the USB UHCI root hub.
 * The USB 1.1 device is configured to wake the computer from the sleep state.



WORKAROUND
To work around this issue, use one of the following methods:
 * Do not use a USB UHCI root hub. Instead, use a high-speed USB Open Host Controller Interface (OHCI) root hub.
 * Disable the Allow this device to wake the computer setting for any USB UHCI root hub in Device Manager. To do this, follow these steps:
 * Click Start, right-click Computer, and then click Manage.
 * In the Navigation Pane, expand System Tools, and then click Device Manager.
 * In Device Manager, expand Universal Serial Bus Controllers.
 * Double-click the USB root hub that you want to modify, and then click the Power Management tab.
 * Click to clear the Allow this device to wake the computer check box, and then click OK.
 * Close the Computer Management window.

Keywords: kbtshoot kbprb kbexpertisebeginner KB923943

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