But in final, it comes because the hardware is hybrid GPU, after disable the AMD GPU and let the Intel (detected as the primary video card), it works
So i think there is a bug in detection on our side but no clue where exactly
Sorry, no ideas Seb - you know far more about screens and d3d devices than I do...
My dev laptop has hybrid graphics (Intel + nVidia), and MP1 runs OK on that (was Win 7, now Win10). The previous laptop was also an Intel+nVidia hybrid, and it worked OK on that as well.
How is MP set up - is 'always on top' enabled ? (I never do this because it's a pain if MP hangs and keeps the focus...)