Dell XPS 15Z (L511Z, Mid 2011) - Manual (Page 33)

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Using Your XPS Laptop
5 Keyboard/Backlit Keyboard — The backlit keyboard provides visibility in dark
environments by illuminating all symbols on the keys.
Backlit keyboard brightness settings — The Ambient Light Sensor on the display
panel detects the available environment light and adjusts the brightness of the keyboard
backlighting. To change the setting manually, press the <Fn><F6> keys to toggle the three
lighting states (in the given order):
full keyboard brightness •
half keyboard brightness •
no lighting •