Microsoft KB Archive/816843

= FIX: Fast swap of USB devices may cause USB host controller to stop functioning in Windows XP =

Article ID: 816843

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Professional
 * Microsoft Windows XP Professional

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SYMPTOMS
If you quickly swap a USB device that is attached to a UHCI USB host controller, the host controller may stop functioning.

Note &quot;Quickly swap&quot; means that you unplug one USB device and plug in another USB device within five seconds.

This behavior typically occurs when the following conditions are true:
 * If the USB device is programmatically controlled to report different device IDs, this behavior causes the device to be re-enumerated as a different device.
 * The behavior does not typically occur when you just unplug one USB device and plug in a different USB device when the steps take longer than five seconds.



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 tool in Control Panel.   Date         Time   Version        Size     File name --  18-Mar-2003  05:47  5.1.2600.1187  137,344  Usbport.sys 18-Mar-2003 05:48  5.1.2600.1187   19,328  Usbuhci.sys



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

Keywords: kbhotfixserver kbqfe kbtshoot kbwinxpsp2fix kbwinxppresp2fix kbfix kbbug kbusb kbqfe kbprb KB816843

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