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Starting with the Latitude™ D620, Dell includes a new feature on its systems
called the ambient light sensor, or ALS. (Dell will eventually expand this
offering to the other notebooks, including the Inspiron™ platform.)
Basically, this device senses the light levels in the area and automatically
adjusts the screen brightness to match. Only the internal display is adjusted,
not any monitor or projector that may be connected to the system.
Additionally, if the sensor window is blocked, it does not function correctly.
The controls for the ALS are built into the QuickSet utilities. Use the left-
arrow key on the keyboard to enable or disable the feature. It is disabled by
default when the system ships. The BIOS has a setting that allows you to
enable or disable the ALS. This function is also tied to the shortcut key. ALS
still function if the QuickSet utilities are not installed, but the pop-up windows
do not appear.
QuickSet Settings
When using the shortcut key on the keyboard to enable or disable ALS, you see one of the following pop-up messages:
ALS Enabled
ALS Disabled
When you click the Click here to set Ambient Light Sensor preferences link, the following window is displayed so you
can adjust the ALS settings:
ALS Controls
The slider bar allows you to select the minimum and maximum brightness levels the display automatically adjusts between
with ALS enabled. It may take some adjustment to find the optimal setting. The lower the minimum and maximum settings,
the more opportunity for battery life savings.
The Enable Ambient Light Sensor to optimize BATTERY SAVINGS option sets the ALS operating range so the system
has battery savings opportunity over the standard battery life bench marking settings. When ALS is enabled at this setting,
the LCD panel brightness range is limited at approximately 10 nits (a unit of measurement of screen brightness) to 60 nits.
Ambient Light Sensor
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22/02/2010
https://dcse.dell.com/SelfStudy/Foundations_2007/Foundations_2007_Portables/Portable
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