Dell ST2321L User's Guide - Page 16

Auto Adjust Brightness Brightness adjusts the luminance of the backlight. Press the button to increase the brightness and Press the button to decrease the brightness (min 0 ~ max 100). Contrast Adjust the Brightness first, and then adjust the Contrast only if further adjustment is necessary. Press the button to increase contrast and press the button to decrease contrast (min 0 ~ max 100). The Contrast function adjusts the degree of difference between the darkest and lightest areas on the monitor screen. Back Press the button to go back to or exit the main menu. Even though your computer recognizes your monitor on startup, the Auto Adjustment function optimizes the display settings for u Input Source NOTE: In most cases, Auto Adjust produces the best image for your configuration. The Input Source menu is to used to select between different video signals that may be connected to your monitor. Auto Select Scan for Sources. Push to scan for available input signals.