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Article ID: 937930 - Last Review: August 29, 2007 - Revision: 2.1

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SYMPTOMS

On a portable computer that is running Microsoft Windows XP, you may be unable to switch between displays. For example, assume that the computer uses the Fn+F8 keyboard shortcut to switch between the computer's built-in display and an external monitor. When you press Fn+F8, the operation to switch between displays may not occur as expected.

Note Fn is the Function key, and it typically appears near the CTRL key on a portable-computer keyboard.

This problem may occur only occasionally. This problem is timing-specific, and it occurs only when you try to switch displays very soon after you connect an external display. For example, if you connect an external display, and then you wait for a full minute before you try to switch displays, this problem does not occur.

CAUSE

This problem occurs because of a bug in the video port driver (Videoprt.sys).

RESOLUTION

Hotfix information

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:
http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)
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.

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.
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Videoprt.sys5.1.2600.314781,66430-May-200710:47x86

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

For more information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:
816915  (http://support.microsoft.com/kb/816915/ ) New file naming schema for Microsoft Windows software update packages
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684  (http://support.microsoft.com/kb/824684/ ) Description of the standard terminology that is used to describe Microsoft software updates

APPLIES TO
  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional
Keywords: 
kbautohotfix kbwinxppresp3fix kbbug kbfix kbexpertiseinter kbqfe kbhotfixserver KB937930
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