Windows 10, WPF, duplicat desktop driver, monitor turn off

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Hey,

I moved from working flawless windows7 setup on Windows 10 one (I know, but if I didn't have to do that I wouldn't).
I had issue with WPF based application that did not show up correctly - I read that its because WPF forms use GPU Acceleration and the default uVNC video driver is software based.
I uncheck "System HookDll" and check "Desktop Duplication" because I read that its the "new mirror driver" for higher Windows versions.

And yes,WPF forms works now, but I can connect to uVNCserver only when Monitor is turn ON (I understand thats the "desktop duplication" thing, because if monitor is off, the there is no desktop at that moment?)

Any workaround this issue? I have monitor plugged into that server but its turn off most the time.

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Monitor is plugged with HDMI cable (I'm writing about this because I found similar thing on realvnc page)

Enabling "System HookDLL" allow me to connect but Application wroten with WPF are not updating forms - you cannot work with them.

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I also noticed that when I'm able to connect when monitor is turn off (System HookDLL), the start menu is acting strange:

- in case image go offline - the menu inside the start menu is super small it works with mouse/arrows but its a lot smaller than normal one.

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Update:
- when I restart PC remotly, and connect to it without turning monitor on, the resolution is smaller (1024x768, should be 1920x1080, maybe that's related to smaller menu), and with both settings (duplicator/hookdll) I see WPF form without issue.

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From what I found this is issue when using monitor with hdmi/displayport that its disabled. Depending on gpu intel/nvidia/amd there are different results.
You need software solution (dunno: https://help.realvnc.com/hc/en-us/artic ... Windows-10) or fake monitor dongel.


Do we have similar setting to test like the one in realvnc: https://help.realvnc.com/hc/en-us/artic ... Windows-10 ?