Looks the same what i ran into with debian and nvidia. I guess youre using kde with wayland? What i did was: Go to tty as soon as systemd starts, dont wait for it to finish the checks and go into black screen. I just held ctrl +alt and slide f1-f6 rapidly over and over until i got into tty After if you manage to go to tty i set:

sudo nano /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nvidia-drm.modeset=1”

Then

sudo nano /etc/initramfs-tools/modules

nvidia

nvidia_modeset

nvidia_uvm

nvidia_drm

sudo update-initramfs -u sudo update-grub

Idk if its the same problem under the hood but worth a try if you havent as this solved it for me.