Using the keyboard - 17 Display toggle Switches display output between the display screen, external monitor (if connected) and both. Display off Turns the display screen backlight off to save power. Press any key to return. Touchpad toggle Turns the built-in touchpad on and off. Speaker toggle Turns the speakers on and off. Volume down Decreases the sound volume. Volume up Increases the sound volume. Scr LK Scroll Lock Turns Scroll Lock on or off. Icon Function Description