Dell E2015HV User Manual page 40

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.
This option is only available when you are using the analog
(VGA) connector.
40 Operating the Monitor
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