Dell D2015H Monitor - Manual (Page 24)

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Operating the Monitor
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.
NOTE: Auto Adjust does not occur if you press the button
while there are no active video input signals or attached
cables.