Microsoft KB Archive/945680

= A USB keyboard does not work after you restart a Windows Vista-based computer that has an NVIDIA 680i motherboard installed =

Article ID: 945680

Article Last Modified on 12/11/2007

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APPLIES TO


 * Windows Vista Ultimate
 * Windows Vista Home Premium
 * Windows Vista Home Basic
 * Windows Vista Enterprise
 * Windows Vista Business
 * Windows Vista Business 64-bit Edition
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Home Premium 64-bit Edition
 * Windows Vista Home Basic 64-bit Edition
 * Windows Vista Enterprise 64-bit Edition

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SYMPTOMS
Consider the following scenario:
 * You are running a Windows Vista-based computer that has an NVIDIA 680i motherboard installed.
 * You plug a USB keyboard into a USB port on the NVIDIA 680i motherboard.
 * You restart the computer.

In this scenario, the keyboard does not work. Additionally, a yellow exclamation mark (!) appears next to the USB device in Device Manager.

If you disconnect and then reconnect the keyboard while Windows Vista is running, the keyboard begins to work. However, this problem occurs again after you restart the computer.



CAUSE
This problem is caused by a timing issue. This timing issue occurs because the Usbohci.sys driver does not comply with USB specifications.



Hotfix information
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 Windows Vista 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

Prerequisites
No prerequisites are required.

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

Hotfix replacement information
This hotfix does not replace any other hotfixes.

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.

Windows Vista, 64-bit versions


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 about software update terminology, 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



The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Keywords: kbbug kbfix kbqfe kbexpertiseinter kbhotfixserver kbwinvistapostrtmfix KB945680

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