Never had issues under KDE, XFCE, Awesome and whatever else non-GNOME desktop environment I used, using DisplayCAL’s “Install display device profile”. Endless problems with Oyranos, kolor-manager, etc. Don’t mix different systems, that will cause issues.
“Install” the profile into the _ICC_PROFILE X11 atom, load the calibration curves into the VCGT.
Watch the console output when you “Install display device profile” using DisplayCAL to see how it does that.
To clear the VCGT, argyll-dispwin -c
To load the calibration curves into the VCGT, argyll-dispwin -L
To learn more, read the documentation for: