Power options and try Change Plan Settings.
I have a Toshiba laptop. I have been searching for how to change how long the back light stays on for keyboard. I always use my laptop plugged in so power settings aren't a concern for me. I'm familiar with going to power settings for managing but have not seen a specific direction for having the keyboard backlight to stay on longer. I really love the convenience of it. If I know the steps of making change I can note it if I would want to change the setting back if I'm using it on battery. Thanks.