RDP does not work good with Mingw and Quick application.

If Mingw is used then with RDP (even connected 32 bit) does not work always. With Angle and Mingw this does not always works and crashes/Freeze with E_OUTOFMEMORY on D3D11.
It may not reproducible on all machine it's different from one computer to another, depending on the GPU.
The only way is to use QT_OPENGL = 'software' to make it work which is much slower and has artifacts.

With D3D11 following code in qtbase\src\3rdparty\angle\src\libANGLE\renderer\d3d\d3d11\Renderer11.cpp is probably the one blocking D3D11.

if (deviceType == d3d11::ANGLE_D3D11_DEVICE_TYPE_WARP) 
{ 
#if !defined(ANGLE_ENABLE_WINDOWS_STORE) && !defined(__GNUC__) 
if (!IsWindows8OrGreater()) 
{ 
// WARP on Windows 7 doesn't support shared handles 
mSupportsShareHandles = false; 
return false; 
} 
#endif // ANGLE_ENABLE_WINDOWS_STORE 

Attached are traces and logs.