You connect a Full-Speed USB device to a USB 2.0 hub on a Windows Vista-based computer, and then you turn the device on.
You put the computer into standby (the S3 power state) or into hibernation (the S4 power state).
You resume the computer from standby or from hibernation.
In this scenario, the USB device no longer works. Additionally, a yellow exclamation mark (!) appears next to the device in Device Manager. When you view the device properties, the device status is reported as code 43.
If a USB transfer is in process for a Full-Speed USB device that is attached to a USB 2.0 hub, and the computer enters and resumes from standby (S3) or hibernation (S4), the Microsoft USB stack cancels the pending transfer. However, the Microsoft USB stack does not send a Clear TT Buffer command to the USB 2.0 hub to allow the hub to start to process new requests.
A supported hotfix is 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 software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
Prerequisites
There are no prerequisites for
installing this hotfix.
Restart requirement
You must restart
the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace a previously released
hotfix.
File information
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.
It may not be obvious that the Full-Speed USB device is connected to a USB 2.0 hub instead of directly to the USB host controller. This may be particularly true for USB devices that are integrated into a laptop computer and that may be connected to an internal USB hub. For more information about USB architecture, visit the following Microsoft Web site:
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