According to Madshi, you should set the video card to full then madvr and the tv to limited. That lets you get black at 16 since Blu-rays don't go lower than that anyway, but also whiter than white that some blu-rays do have.
Madshi: I experienced a really weird issue. I finally decided to just disable my igpu since I was tired of all the blue-screens losing intel quicksync for decoding through lav and going with dxva copy-back. When I then went to play a video, I got horrible frame drops for a minute or so before the screen would turn green. I finally found the problem to be use a separate device for dxva processing. When I disabled it, everything went back to normal with no frame drops.
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