Advanced Display Options 9
Display Control Tab
Force Single Display Operation, when using a dual display video card, causes all display modes to appear as a single list of supported resolutions in the Apple® Displays Properties.
Only one display is on when this feature is enabled. The default setting is Disabled.
Enable GTF Modes for CRT provides a list of all available modes for your monitor based on the Generalized Timing Formula standard. This feature is enabled by default.
Enable ATI “Valid” and “Safe” flags in mode list, when enabled, lets the video card to determine which video modes are valid and safe.
Enable Hot Plug Detection lets the operating system automatically detect when a display is connected to the computer and activates the “Detect Displays” button. This removes the need to restart the computer after attaching a secondary display.
Default button undoes all changes and sets everything to the factory default settings.
Apply button causes all the selected options to be enabled at one time.