So in case you are running out of battery you can disable the backlight or if you are working in an environment where there is adequate lighting you can always turn off the backlight.
Surface pro 4 keyboard backlight turn on.
A light appears on the fn keys when the keys are locked into function mode.
Press the fn key again to unlock them.
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.
Enable keyboard lighting and select the brightness you want.
If you want to turn it on you can press and hold the key next to the key which you.
Press the fn key to lock the function keys.
To turn off the backlight in the surface keyboard press the key next to esc key see the image below.
If you keep on pressing this key you can see that the backlight intensity goes down until it switches off completely.
Next choose the time for keyboard backlight s auto shutdown.
Decrease the keyboard backlight off with fn f1.
Click on the tab to access additional options.
For surface 3 type cover type cover for surface pro 4 surface go signature type cover surface pro signature type cover surface laptop and surface book.
Simply press fn del to increase or the fn backspace buttons to decrease the display brightness.