I have an old 2013 Notebook with Intel integrated graphics and a discrete GT525M GPU. Being not at home for christmas today, I started a game on it for the first time in years. It did not launch, DX 11 title. Another crashed but worked in DX9 using the integrated graphics. Google is your friend and revealed to me that the function is broken in all Windows 10 drivers and was last working in version 350.12. I installed those, and sure enough all the games refusing to work before run fine again. Also seems like Nvidia were made aware of that long ago. Why did that not get fixed ?