Dell XPS 15 9520 External Display Connection Guide - Page 8

With the computer display turned off, the compatibility between computer and dock.

Page 8 highlights

With the computer display turned off NOTE: Ensure that you turn off your computer's display before connecting the external displays. For more information, see Turn off the computer display. NOTE: Connect and configure at least one external display before disabling the computer internal display. NOTE: The resolution, refresh rate, and maximum number of external monitors supported by the dock are dependent on the compatibility between computer and dock. You can connect up to three external displays directly to the Type-C ports on your computer or you can connect the displays to the computer using the docking station. 8 Connect external displays

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With the computer display turned off
NOTE:
Ensure that you turn off your computer's display before connecting the external displays. For more information, see
Turn off the computer display
.
NOTE:
Connect and configure at least one external display before disabling the computer internal display.
NOTE:
The resolution, refresh rate, and maximum number of external monitors supported by the dock are dependent on
the compatibility between computer and dock.
You can connect up to three external displays directly to the Type-C ports on your computer or you can connect the displays to
the computer using the docking station.
8
Connect external displays