Tap PropertiesàBacklight tab to adjust the backlight timeout. Use the drop-down menus to set the amount of idle time before the backlight turns off when the device is using battery power or external power.

Setting the Backlight Timeout

After the timeout has turned off the backlight, any screen tap or button activation will turn the backlight on again at its previous brightness level.

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Compaq 2100 manual Setting the Backlight Timeout