Kernel 5.12 and up won't boot on my hw

I have a ryzen 2700, vega56 reference video card, which work fine while using any kernel from the 5.10 or 5.11 range, yet when I try to boot from kernel 5.12, my monitors shut off shortly after entering LUKS pw. When I try to boot using kernel 5.13, I don’t even get to the LUKS password entry ‘form’. Anyone else experiencing this, or not?

(I’m afraid I don’t have any logs to offer, or photo’s from the boot sequence loading info.)