Hello Glenn,
This is targeted to be behaving correctly in the OS for Windows 10 v1903 (19H1 builds available today through Windows Insiders): content will be able to be rendered on the more powerful GPU (through OS application selection) even when the "main" display (with the system tray) is an indirect display (like DisplayLink, Miracast...). The bug which was removing all displays from the secondary GPU has been identified.
We are still meeting challenges with AutoCAD though, which seems to crash at startup. We're working with Microsoft on this to understand if this is an application graphics adapter enumeration or OS issue. We might need to engage with AutoCAD.
In the meantime, changing your "main display" to be the laptop should help.
Kind regards,
Alban
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