Dell U2711 Monitor - Manual (Page 22)

Brightness
Contrast
Back
Brightness adjusts the luminance of the backlight.
Touch the button to increase brightness and touch the button to decrease brightness (min 0 ~ max 100).
Adjust Brightness first, and then adjust Contrast only if further adjustment is necessary.
Touch the button to increase contrast and touch 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.
Touch to go back to the main menu.
Auto Adjust
Even though your computer recognizes your monitor on startup, the Auto Adjustment function optimizes the display settings for use with your particular setup.
NOTE: In most cases, Auto Adjust produces the best image for your configuration. This option is only available when you are using the analog (VGA)
connector.
Input Source The Input Source menu is to select between different video signals that may be connected to your monitor.