profiling a display in HDR mode will likely not give good results because the display will do its own HDR processing (and employ aggressive auto-dimming/ASBL/power-saving which will negatively affect any measurements). The only work-around is to profile the display in SDR mode, but then you won’t get the high HDR peak luminance.
Thank you Florian! Then I think I have to “trust” my monitor in HDR mode , rather than try to profile it… XD
Maybe nowadays the best way to enjoy HDR is getting a high end OLED TV such as LG C9 this year (based on the introduction in CES 2019, the LG OLED this year will have build in pattern generator. And support uploading custom HDR tone mapping when using Calman.)