When we leave laptop or desktop, we need to use keyboard or touch panel to lock screen and
system will wait power option setting to turn off display backlight.
We propose good method to use finger to touch light sensor twice quickly to lock your PC and
turn off backlight to reduce system power and keep laptop with security before you leave
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INC, HP, "A GOOD METHOD TO TURN OFF BACKLIGHT AND LOCK WINDOWS BY TOUCHING LIGHT SENSOR", Technical Disclosure Commons, (September 16, 2019)