How can I turn off the backlight to save power？ Miguel March 10, 2020 07:57 Press the fn+light button to turn the backlight off / on. Related articles How to disable Auto Sleep Mode? Why does my keyboard suddenly not light up? How do I adjust the speed of the backlight or the slow down the light? If I turn off automatic sleep mode, do I have to turn off the keyboard (by switch) every time I turn off my PC? When is the firmware available for Mac?