madVR does switch the display to HDR10 mode when using nvidia video cards. When it works, displaying its OSD (Ctrl+J) will show (NV HDR) instead of (Windows HDR).
Perhaps there are some settings which prevent it to do that on your system. Check that you have “passthrough HDR to display” and “send HDR metadata to the display” in madVR device “hdr” tab, and that you have “use Direct3D 11 for presentation” in the “rendering, general settings” tab. You will likely want to have “enable automatic fullscreen exclusive mode” in the “rendering, general settings” tab as well. I am not sure, but maybe you need to have 10 bit output forced in the nvidia control panel as well for it to work.
In madTPG, the switch should happen as soon as you click on the HDR button in its toolbar. Sony TVs switch quite quickly to HDR compared to LG TVs. Press the i+ (Info) key on the remote (or Display on US remotes) and it should say that it’s in HDR10 mode.
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