Microsoft KB Archive/920875

= USB devices that are disconnected and then reconnected to a USB hub may not be detected on a Windows XP-based computer =

Article ID: 920875

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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SYMPTOMS
Consider the following scenario:
 * You have a universal serial bus (USB) hub that is connected to a Microsoft Windows XP-based computer.
 * You have a USB device that is connected to the hub, and the USB device works correctly.
 * You disconnect the USB device from the hub, and then you reconnect the USB device to the hub.

In this scenario, Windows may not detect the USB device when it is reconnected to the hub. When this problem occurs, the USB device does not work correctly. Additionally, Device Manager lists the USB device as an unknown device.



RESOLUTION
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Prerequisites
To apply this hotfix, you must have Windows XP Service Pack 2 (SP2) installed on the computer.

Restart requirement
You must restart your computer after you apply this hotfix.

Hotfix replacement information
This hotfix replaces the hotfix that is described in the following Microsoft Knowledge Base article:

922128 You do not receive notification when the USB bus is overloaded on a Windows XP-based computer



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

For more information about problems that may occur when you connect a USB device to a computer, click the following article number to view the article in the Microsoft Knowledge Base:

871233 A USB device is not recognized if you attach it immediately after your Windows XP-based computer comes out of standby or hibernation

Keywords: kbusb kbfix kbhotfixserver kbqfe kbpubtypekc KB920875

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