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Old 04-25-2021, 06:52 PM   #2
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Join Date: Sep 2015
Location: Cambridge, UK
Posts: 1,626

This is because your desktop keeps the display connector alive as if it had a monitor even if there's no monitor on it.
It would still be there if you undock, but as you've got no display left, you can't see there's still a display allegedly recognised. Nothing to do with the dock, but it's how your desktop was made.
You could use Windows+P to change to external only instead of duplicate, or check in the bios if you can disable that ghost display when there's no display on the connector.
Best regards,
Alban Rampon
Senior product manager, universal docking stations and accessories
"DisplayLink is proud to be a Synaptics brand."

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