Backlight
The backlight settings use the preconfigured set of default timeouts and is synchronized to the User Idle setting in the Schemes tab in the Power control panel.
When the backlight timer expires, the touch screen backlight is dimmed, not turned off. When both checkboxes are unchecked, the backlight never turns off (or dims).
Default values are 3 seconds for Battery, 2 minutes for External and both the check boxes are enabled.