Article ID: 871233 - View products that this article applies to.
When you plug a USB device into a Windows XP-based computer immediately after the computer resumes from standby or hibernation, the computer does not recognize the USB device. When this occurs, you receive the following warning message:
Unrecognized device has been found.
When the computer resumes from standby or hibernation, there is a five-to-ten-second period when the selective suspend feature of the USB driver interferes with detection of the new USB device. The time delay depends on the following factors:
Unplug the USB device, and then plug the device back into the computer or hub. If your computer still does not recognize the device, go to the "Workarounds" section.
If your computer does not recognize the USB device, first try method 1 to work around this issue.
Method 1: Initiate recognition of the USB device by using Device ManagerTo initiate recognition of the USB device by using Device Manager, follow these steps:
If this method does not resolve the issue, go to method 2.
Method 2: Disable power management of the USB hubNote If you perform the following procedure, you may also reduce the battery life on a portable computer.
Use this method if method 1 does not work. To disable power management of the USB hub, follow these steps:
Method 3: Restart the computerTo initiate recognition of the USB device, first unplug the USB device and restart the computer. Then, wait five to ten seconds before you plug the USB device into the computer or hub. Windows XP recognizes the new device.
If this method does not resolve the issue, you might want to review the articles in the "Similar Problems and Solutions" section, or contact Support. For information about how to contact Support, visit the following Microsoft Web site:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
If the methods in this article do not resolve the issue, try the troubleshooting steps offered in similar Microsoft Knowledge Base articles. For more information about advanced troubleshooting tips for general USB problems, click the following article number to view the article in the Microsoft Knowledge Base:
310575For more information about how to troubleshoot unknown devices in Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/310575/ )Advanced troubleshooting tips for general USB problems in Windows XP
314464If these articles do not resolve the issue, visit the following Microsoft Web site for information about how to contact Support:
(http://support.microsoft.com/kb/314464/ )How to troubleshoot unknown devices that are listed in Device Manager in Windows XP
Article ID: 871233 - Last Review: May 22, 2013 - Revision: 4.0