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I am also a MS-16L1 user has also been suffering from P5200 displayport can not output, until one day I tried to use NVIDIA dp firmware upgrade 1.0, although the results show that "This tool is for use with add-in graphics cards only", but my laptop dp interface connected to the monitor can work properly. And as long as I don't shut down or log off everything works fine, playing Cyberpunk 2077 frame rate as usual, and there is no bug.(presumably disable the graphics driver and then enable it, you can also use gpu-z's save vbios button) I hope someone can find a long-term solution.