Press the fn key to lock the function keys.
Surface pro 4 keyboard backlight turn on.
Of course you can also use the new display brightness buttons in the action center with.
If you want to turn it on you can press and hold the key next to the key which you.
A light appears on the fn keys when the keys are locked into function mode.
To turn off the backlight in the surface keyboard press the key next to esc key see the image below.
Simply press fn del to increase or the fn backspace buttons to decrease the display brightness.
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If you keep on pressing this key you can see that the backlight intensity goes down until it switches off completely.
Increase the keyboard backlight on with fn f2.
Click on the tab to access additional options.
So this is how you turn the backlight of the keyboard on or off.
Activating the special keys increases or decreases the keyboard backlight on the surface keyboard.
Press the fn key again to unlock them.
Decrease the keyboard backlight off with fn f1.
Move the slider under the keyboard backlight tab to the right to enable the backlight.