Yeah it’s working for me on kernel 6.1 and 6.5 with mesa 23.1 on both my rx 570 and rx 7600. Only on display port. As long as you get the adaptive sync option in the kde display settings it should be on. You can test with VRRTest and look for stuttering when getting close to native refresh rate. Or if your monitor has a refresh rate overlay you can watch that change.