Hi! Im so angry!! I have the exact same problem. I think it happened when i changed GPU scaling or/and when changing 10 bit to 8 bit and to RGB full range. This i can change with no issue on my rtx 2080 and 1080 TI. Or i get blackscreen. It has driven me mad! I have done everything nothing works. I cant even disable gpu scaling it just re enables it self. Maybe thats why this is happening. Im doing an RMA!
No, i did a bug report on this. I just found something amazing and a workaround, i have posted it here in the forum in the same category as this one, you must read it! It will be up soon, they are reviewing it for approval