Article ID: 895962 - View products that this article applies to.
You disconnect a universal serial bus (USB) 2.0 printer from the USB port on your Windows XP-based computer. In this scenario, an external USB 2.0 hub that is connected directly to another USB port on your computer may stop working.
Note This problem may also affect a port replicator that works as a USB 2.0 hub.
This problem may occur if either of the following conditions is true:
To work around this problem, use whichever of the following methods is best for your setup.
Method 1: Connect the USB 2.0 printer to the external USB 2.0 hub instead of to the USB port on your computerIf this workaround works for you, you are finished with this article. If this workaround is not a good solution for you, try Method 2.
Method 2: Disable power management of the USB 2.0 hubNote This procedure may reduce the battery life on a portable computer.
Method 3: Edit the registry to disable selective suspend mode for all USB host controller drivers in the systemTo have us fix this problem for you, go to the "Fix it for me" section. If you would rather fix this problem yourself, go to the "Let me fix it myself" section.
Fix this problem
To fix this problem automatically, click the Fix it for me link. Then, click Run in the File Download dialog box and follow the steps in this wizard.
Fix this problem
Microsoft Fix it 50052
Note this wizard may be in English only; however, the automatic fix also works for other language versions of Windows.
Note If you are not on the computer that has the problem, you can save the automatic fix to a flash drive or to a CD and then run it on the computer that has the problem.
Now go to the "Did this fix the problem?" section.
Let me fix it myselfImportant 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
This procedure describes how to modify the following registry setting:
Value: 1 disables selective suspend mode. 0 enables selective suspend mode.
Check whether the problem is fixed. If the problem is fixed, you are finished with this article. If the problem is not fixed, you can contact support
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
In Windows XP, the USB core stack supports selective suspend mode. A driver can use this mode to turn off the USB device that the driver controls when the device becomes idle. This mode works even when the computer remains in a fully operational power state (S0). For example, a driver can make the following devices idle: