Hello Cpcfreak,
You're correct that some changes were made for switchable graphics in Windows 10 v1903 (19H1).
Unfortunately, these changes also break the docking use cases pretty badly, as you indicated.
Windows 10 20H1 Insiders build 18932 and newer is fixing that.
With the Windows 10 you have, marking the laptop display as main display before launching the application will allow the application to start properly, even when docked.
We have asked for the fix, tested in Windows 10 20H1 to be distributed to Windows 10 v1903 via the monthly patches.
If it is approved, we will then be able to use the dGPU for gaming (graphics computation), and still use the iGPU for our encoding (the POST GPU) on DL-6xxxx products, which would bring the best Windows 10 performance than until today as it would be leveraging both GPUs.
The encoder used for the Dell D3000 is on CPU though, so you'd have the game computing on dGPU and encoding on CPU. You will still see an uptick in performance as until Windows 10 v1809 (RS5), Windows would have made the game use the iGPU when docked, regardless of any other settings you tweak because it tends to be the POST card.
Kind regards,
Alban
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