Try out the mentioned steps below in this post to fix such issues. It is seen that after a fresh windows installation and a major windows update, the keyboard Backlight stops working or the lights get fixed with the same intensity. Refresh and check each hardware component to fix this issue. It is possible that the manufacturer’s hardware does not sync properly with the windows operating system. Try out the mentioned steps below in this post, to know how to install proper ATK drivers. ATK utility key assigns functions to different keys like changing screen brightness, turning on wireless networking, switching between monitor and external video source and turning on keyboard lights.
