I got the same miracast issue with my Dell venue 8 pro. I can't clone/mirror in miracast mode when displaylink drivers are installed. I'm using the Netgear PTV3000 and an ebay miracast dongle (ipazzport/rockchip) so its not adapter specific.
I have to uninstall the displaylink software to get the clone feature back in miracast.
I also get the excessive battery drain on connected standby when displaylink drivers are installed.
This was with v7.4 drivers
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