Basic Operation Operating Your Computer To use the Fn hot keys The combination of the Fn key plus another key creates a hot key —a shortcut key sequence—for various system controls. To use a hot key, press and hold Fn, press the appropriate second key, and then release both keys. This hot key Does this Fn+F1 Decreases the display brightness. Fn+F2 Increases the display brightness. Fn+F5 Toggles among the built-in display, an external display, and simultaneous display on both. Fn+F8 Toggles the built-in keypad on and off. Does not affect an external keyboard. If Num Lock is on, then the numeric functions are active; otherwise, cursor control is active (as marked on an external keyboard).
Fn+F12 Enters Hibernate mode. Fn+NumLock Toggles Scroll Lock on and off. Fn+Page Up Increases the audio volume and cancels the mute setting. Fn+Page Down Decreases the audio volume. Fn+Backspace Mutes the audio output. 30 Reference Guide