Dell Latitude D631 (Early 2009) - Manual (Page 45)

Using the Display 45
2 Click the monitor 2 icon, uncheck the Extend my Windows desktop onto this monitor option, and
then click Apply.
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 the Start button and click Control Panel.
2 Under Pick a category, click Appearance and Themes.
3 Under Pick a task..., click the area you want to change, or under or pick a Control Panel icon, click
Display.
4 Click the Settings tab→ Advanced→ Displays tab.
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
1