The available options are: Auto - The keyboard backlight will turn on when a key is pressed. On - The keyboard backlight stays on -- until you press Fn + Z to turn it off. Off - The keyboard backlight stays off -- until you press Fn + Z to turn it on.How do you turn on the light on the keyboard?
Go to System Preferences -> Keyboard and, in the Keyboard tab, turn off (uncheck) "Automatically illuminate keyboard in low light". Then, if you turn the brightness down all the way, it should never turn on.How do you turn on keyboard light on Dell laptop?
To Turn On Backlit Keyboard in Dell laptops like Studio/Vostro/XPS/Latitude, “Hold the Fn key and press the Right Arrow key”. You can see all symbols illuminating on the keys. With the same hotkey, you can toggle between the three lighting states (in the given order). The lighting modes are full keyboard, half keyboard and off.