How to turn on or off the keyboard light (backlight) on ...
If there is no light icon on the Space button, it means the system is not configured with backlight. To turn on or off the backlight, press Fn + Spacebar on the keyboard. The keyboard backlight has three modes: Off, Low, High. Use Fn + Spacebar to change the modes of the keyboard backlight. Select ThinkPad R, T, X, and Z-series laptops have the ThinkLight as shown below.
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