This article explains how to turn on the keyboard backlight on a Lenovo laptop.
Lenovo Laptop Keyboard Lights On/Off Explained in 3 Steps. (Thinkpad, Yoga, Ideapad, etc.)
These steps work for Lenovo IdeaPad and ThinkPad laptops with backlit keyboard.
Find the keyboard backlight shortcut on your Lenovo laptop. Most laptops will put a light icon on the space bar, but check the Esc key as well.
Hold down the Fn key (Function key), press the space bar once, and then release both keys.
