Samsung SyncMaster XL20 Owner's Manual page 27

Menu Description
When the 'AUTO' button is pressed, the Auto Adjustment screen appears
as shown in the animated screen on the center.
Auto adjustment allows the monitor to self-adjust to the incoming video
signal. The values of fine, coarse and position are adjusted automatically.
(Available in analog mode only)
To make the automatic adjustment function sharper, execute the 'AUTO'
AUTO
function while the AUTO PATTERN is on.
- If auto adjustment does not work properly, press AUTO button again to
adjust picture with more accuracy.
- If you change resolution in the control panel, auto function will be
executed automatically.
Locked
- AUTO button