I have a laptop with a Intel Core i5 6300HQ, which has a Intel HD 530 iGPU and an Nvidia GTX 960M GPU using Nvidia Optimus technology. Using the latest Windows 10 2004 Build 19041.264 and Intel Driver 126.96.36.19980. Running DxDiag shows the WDDM version of the driver as WDDM 2.1.
Windows 10 2004 has a new functionality called Hardware Accelerated GPU Scheduling that provides smoother video playback and average framerates, but it requires a WDDM 2.7 driver. Plus, the current low WDDM version of the driver is interfering with some of the Nvidia discrete GPU's functionalities, according to an Nvidia rep: https://forums.guru3d.com/threads/nvidia-geforce-446-14-whql-driver-download-discussion.432442/page-9#post-5794783
Intel should release a WDDM 2.7 driver for Intel 6th Generation Processors.
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W10 2004, W10 May 2020, W10 20H1, W10 19041 - A rose, by any other name, still smells.
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