Dell Latitude D820 Technical Manual page 28

If necessary, press <Fn><F8> to bring the screen image back to the computer display.
Swapping Primary and Secondary Displays
To swap your primary and secondary display designations (for example, to use your external monitor
as your primary display after docking):
1. Click Start→ Control Panel→ Display→ Settings→ Advanced→ Displays.
See the documentation that came with your video card for additional information.
Using the Ambient Light Sensor
The ambient light sensor (ALS) is located on the bottom of the computer display panel. The ALS
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 ALS feature by pressing the <Fn> and left-arrow key combination.
NOTE: Do not cover the ALS with any adhesive labels. If covered up, the ALS automatically sets
the display brightness to the minimum level.
1 ambient light sensor
The ALS is disabled when your computer is shipped to you. If you enable the ALS and then use any of
the display brightness key combinations, the ALS is disabled and the display brightness is increased
or decreased accordingly.
Dell™ QuickSet allows you to enable or disable the ALS feature. You can also adjust maximum and
minimum brightness settings that are activated when you enable the ALS feature. For more
information about QuickSet, right-click the
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.
icon in the taskbar, and click Help.