Dell P1914S Monitor - Manual (Page 36)

Auto Adjust Use this key to activate automatic setup and adjust menu.
The following dialog appears on a black screen as the
monitor self-adjusts to the current input:
Auto Adjustment allows the monitor to self-adjust to the
incoming video signal. After using Auto Adjustment, you
can further tune your monitor by using the Pixel Clock
(Coarse) and Phase (Fine) controls under Display Settings.
NOTE: Auto Adjust does not occur if you press the
button while there are no active video input signals or
attached cables.
This option is only available when you are using the analog
(VGA) connector.
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Operating the Monitor