Defines the amount of time the backlight stays on as long as there is no activity on the computer. This setting significantly affects the life of the battery. If you set a longer device turns off after value, you will use the power in the battery at a faster rate.
Options for Backlight Turns Off After may be Disabled, 10 seconds, 30 seconds, 1 minute, 2 minutes, 3 minutes, 4 minutes, or 5 minutes.
1 minute
Device Settings > Screen > Backlight - Battery Power > Backlight Turns Off After