I have noticed an odd behavior: JPEGs in AdobeRGB appear to be too little saturated if imported to dt. In all other color managed programs they look more saturated.
Here is how a photo in AdobeRGB or any other medium gamut RGB looks like in Firefox:
Here is how it looks in dt:
The (edited) raw itself looks in dt more similar to the JPEG when opened in Firefox.
I think my color management is set up properly via dispwin. I have also tried to set the rendering intent to relative colorimentric, and I have also tried LittleCMS, and I have also tried softproof, no difference.
I have not yet done other extensive tests, don’t know if the colors are less saturated with other color spaces/profiles (except linear Prophoto, same result), or e.g. other file types. However I have tried 2 different screen profile types, XYZ Lut + matrix and curves + matrix. No difference.
Using dt 3.1 on Debian Bullseye. I have a BenQ SW240 screen, properly calibrated and profiled, 110% AdobeRGB. So maybe this is not visible on sRGB screens.
Hope this is useful info.
Edit: sRGB seems to be ok.