Dell Latitude D620 - Manual (Page 19)

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 icon in the taskbar, and click Help.
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1 ambient light sensor
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.