I am experiencing this exact same issue on Debian 13 (Trixie) using a hybrid laptop with an AMD CPU and an Nvidia RTX 3060 running the newer 595 driver series under GNOME Wayland.
On cold boots, the system consistently drops to a black screen before reaching the GDM3 login interface, although the system remains responsive to SysRq (REISUB) commands. I managed to completely stabilize the boot process and keep Wayland running by applying the following workarounds: 1. Forced early KMS for Nvidia by adding 'nvidia', 'nvidia_modeset', 'nvidia_uvm', and 'nvidia_drm' to /etc/initramfs-tools/modules. 2. Added 'initcall_blacklist=sysfb_init' to GRUB_CMDLINE_LINUX_DEFAULT to prevent early framebuffer resource conflicts between the AMD integrated graphics and the Nvidia card. 3. Enforced the Wayland session natively by adding 'DefaultSession=gnome-wayland.desktop' under [daemon] in /etc/gdm3/daemon.conf. 4. Added 'options nvidia NVreg_DynamicPowerManagement=0x02' to /etc/modprobe.d/nvidia.conf to ensure the GPU power states do not disrupt the GDM initial display handoff. Hopefully, these adjustments regarding early module loading and sysfb blacklisting can be integrated into the default configurations for hybrid AMD/Nvidia setups on recent drivers.
