ViewSonic VP2771 User Manual page 61

Ambient light sensor: Automatically adjusts the monitor's
brightness to the optimal settings based on the level of brightness in
your environment.
Step 1: Active your OSD
Step 2: Select the "Setup Menu"
Step 3: Select the "Ambient light sensor" menu
Input
In the Ambient Light Sensor sub-menu, you can use the following
Select
three option to adjust brightness.
Ambient Light Sensor
Presence Sensor
Multi-Picture
ECO Mode
Presence sensor: The human sensor prompts the monitor to
switch to power saving mode (backlight off only) when you are
absent for more than 15 sec and turns the backlight on again when
you return after 3 sec.
Step 1: Active your OSD
Step 2: Select the "Setup Menu"
Step 3: Select the "Ambient light sensor" menu
Under the Presence Sensor sub-menu, you can select from three
options to set the desired level.
Ambient Light Sensor
Audio View
Adjust Mode
HAL Luminance
MAL Luminance
LAL Luminance
Input Audio
Select Adjust
Presence Sensor
Multi-Picture
ECO Mode
Color
Adjust Image Adjust
On
Off
View
Mode
Off
Level 1
Level 2
Level 3
LAL Luminance
57
Manual Setup
Menu
50
Color
Adjust