Configuring video adapters

Testing a video adapter configuration

When you add or change resolutions, you have the opportunity to test the new resolution. When you select Test... and click on Continue after the information message, you see a test pattern. If the pattern displays normally, click on OK to configure the resolution; if not, select a different resolution.

WARNING: If you selected settings that are incompatible with your hardware (for example, you selected the wrong video adapter), you might not be able to read the display after ending the test or you may lose the ability to reset the display to a normal state.

If you cannot read your display after ending the test, press the <Ctrl>, <Alt>, and <Bksp> keys at the same time to exit the X server. If you still cannot read your display, you must reboot your computer to reset the display. Be sure to warn any users logged into your system before rebooting.