Thanks... Dell should just add a note to the Ambient Light screen that says it's disabled when the computer is running on power.

<ADMIN NOTE: Broken link has been removed from this post by Dell>

Using the Ambient Light Sensor

The ambient light sensor is located on the bottom of the computer display panel. The ambient light sensor detects available environmental light and automatically increases or decreases the display backlighting to compensate for low-light and high-light environments.

You can enable or disable the ambient light sensor by pressing the and left-arrow key combination.

NOTE: Do not cover the ambient light sensor with any adhesive labels. If covered up, the ambient light sensor automatically sets the display brightness to the minimum level.

 

 

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ambient light sensor

The ambient light sensor is disabled when your computer is shipped to you. If you enable the ambient light sensor and then use any of the display brightness key combinations, the ambient light sensor is disabled and the display brightness is increased or decreased accordingly.

NOTE: The ambient light sensor is disabled when your computer is connected to an electrical outlet.

Dell™ QuickSet allows you to enable or disable the ambient light sensor. You can also adjust maximum and minimum brightness settings that are activated when you enable the ambient light sensor feature. For more information about QuickSet, right-click the icon in the taskbar, and click Help.

NOTE: Rebooting the computer returns the ambient light sensor to the last setting of enabled or disabled. NOTE: The ambient light sensor adjusts the display backlighting on your portable computer only. It does not control the brightness on any external monitors or projectors.