If you’ve performed an update recently power cycle your computer to see if it will turn back on. If your backlight no longer works after a drop it may be as simple as a loose cable. Other causes of your keyboard backlight woes can be attributed to hardware issues or even software updates. The keyboard backlight option should appear.
Most laptops come with native apps for managing keyboard backlight brightness.
Select OK once you are happy with the changes you made.You can select options between five seconds and 15 minutes, as well as Never off if you don’t want the backlight to turn off automatically when your laptop is inactive. Next, choose the time for keyboard backlight’s auto shutdown.Enable Keyboard lighting and select the brightness you want. Click on the tab to access additional options.Move the slider under the Keyboard backlight tab to the right to enable the backlight. Open the Windows Mobility Center, and you will see a few options.When the Control Panel window opens, look for the Windows mobility center tab. Click the Start button and type Control Panel in the search bar.