Comment # 20 on bug 1179092 from Gerhard Lorbeer

Same Hardware (UHD Graphics 630). One UHD Monitor attached via DP.
Kernel 5.10.3-1.2-X86_64 no problems.
Since update today to 5.10.4-1.1-X86_64 Monitor goes black after a time.
No reaction on mouse or keyboard.
Same behaviour in console-mode (Strg-Alt-F1).

My workaround to boot in old kernel 5.10.3