When a Dell™ computer is running on battery power, you can conserve power by setting the brightness to the lowest comfortable setting by pressing <Fn>

and the up- or down-arrow key on the keyboard.

NOTE:

Brightness key combinations only affect the display on your portable computer, not monitors or projectors that you attach to your portable

computer or docking device. If your computer is connected to an external monitor and you try to change the brightness level, the Brightness Meter may

appear, but the brightness level on the external device does not change.

You can press the following keys to adjust display brightness:

Press <Fn> and the up-arrow key to increase brightness on the integrated display only (not on an external monitor).

Press <Fn> and the down-arrow key to decrease brightness on the integrated display only (not on an external monitor).

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 <Fn> 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.

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 QuickSet 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.

Switching the Video Image

When you start the computer with an external device (such as an external monitor or projector) attached and turned on, the image may appear on either the

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