Overriding default behavior

On the Sound page, you can set a different level of hardware acceleration by moving the slider. You must be a system administrator to change the hardware acceleration levels. This level remains in effect after you have closed the Microsoft DirectX Diagnostic Tool.

You can disable hardware acceleration for Microsoft DirectDraw or Direct3D, if such acceleration is available. To do so, go to the Display page for each display device, and then click Disable. After you have disabled hardware acceleration, it will not be available to any application, even after you close the DirectX Diagnostic Tool. To re-enable hardware acceleration, click Enable on the appropriate Display page.

 Note

• Disabling DirectDraw acceleration also disables acceleration for Direct3D.

You can also override the monitor refresh rate set by DirectDraw full-screen applications. You should do this only if you are experiencing display problems with an application and have good reason to believe that the application is setting an invalid refresh rate.

To set an override refresh rate

1. On the More Help page, click Override.
2. In the Override DirectDraw Refresh Behavior dialog box, select Override Value and enter a valid refresh rate for your monitor.
3. Click OK.

To cancel the override refresh rate and allow DirectDraw applications to set their own refresh rate

1. On the More Help page, click Override.
2. In the Override DirectDraw Refresh Behavior dialog box, click Default.