I have lost 2 days (resumed with back-up image on first time) finding the cause, that made Win 11 lock-up totally after inserting password on login.
After I made the display profiles again and faced the exactly same problem, the solution was simple.
Go into safe-mode and delete the made HDR-profiles.
I don't know if this is on AMD or Microsoft. But it should be checked out ASAP!
I have 2 Samsung HDR-capable displays. One on DP and other on HDMI, though I don't believe that matters to this problem.
6900XT GPU, with the newest drivers.