Dell S1909WFP Monitor - Manual (Page 16)

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
Auto Select
VGA
DVI-D
Back
The Input Source menu is to used to select between different video signals that may be connected to your monitor.
Scan for Sources. Push to scan for available input signals.
Select VGA input when you are using the analog (VGA) connector. Push to select the VGA input source.
Select DVI-D input when you are using the Digital (DVI) connector. Push to select the DVI input source.
Push to go back to or exit the main menu.
Color Settings Use the color settings to adjust the Image mode and color format.
Image mode submenu for VGA/DVI-D input