Microsoft KB Archive/216166

= How to Modify the Video Refresh Frequency in the Registry =

Article ID: 216166

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT 4.0 Service Pack 1
 * Microsoft Windows NT 4.0 Service Pack 2
 * Microsoft Windows NT 4.0 Service Pack 3
 * Microsoft Windows NT 4.0 Service Pack 4
 * Microsoft Windows NT Server 4.0 Enterprise Edition
 * Microsoft Windows NT 4.0 Service Pack 4

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This article was previously published under Q216166



IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SUMMARY
Some video drivers for Windows NT may not support the Refresh Frequency box feature on the Settings tab in the Display Properties dialog box. However, you can control this setting using a Windows NT registry value.



MORE INFORMATION
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

To change the monitor refresh rate using a registry value:

 Click Start, click Run, type regedt32, and then click OK. On the Windows menu, click HKEY_LOCAL_ MACHINE on Local Machine.  Double-click the

System\CurrentControlSet\HardwareProfiles\Current\System\CurrentControlSet\Services folder. Double-click the folder for your video driver (for example, if you have a video display adapter that is based on the S3 chip set, double-click the S3 folder), and then click the Device0 folder.  If there is no DefaultSettings.Vrefresh value, go to step 5. If there is an existing DefaultSettings.Vrefresh value, double-click the value and then type a numerical setting (from the table below) that is supported by your monitor in the Data box, and then click OK. Go to step 7. If the value does not exist, click Add Value on the Edit menu, type DefaultSettings.Vrefresh, click REG_DWORD in the Data Type box, and then click OK. Type 3c in the Data box, click Hex, and then click OK.</li> Quit Registry Editor, and then restart the computer.</li></ol>

NOTE: The refresh frequency must be specified in hexadecimal. Refer to the table below for common monitor refresh rates and their equivalent hexadecimal values.

Refresh Rate (in MHz)

Keywords: kbhowto kbenv kbdisplay KB216166

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