huge thanks

[aufkrawall]

This tool works flawlessly for me on RDNA2, calibration sticks after reboots, in fullscreen etc. and verification results with VCGT of the ICC profile applied are very good (BT.1886 gamma curve). It's really perfect for me.

Your other tool that makes use of Windows ACM also works great, but it seems there is a driver bug, as the driver doesn't parse the custom EDID information about non-available HDR correctly until GPU scaling in Radeon Settings is toggled once (Maybe there is some CLI workaround for it available? No idea.).