Bug#1109077: sddm: does not start automatically after nvidia-driver installation (in live-build-installed system)

[daniel.gestl@it-yourself.at]

Update:

After removing the `quiet` and `splash` boot parameters from the GRUB 
configuration, the issue no longer occurs — the graphical login starts 
as expected after reboot, without additionally delaying sddm start.

This suggests that the root cause is not purely a systemd race 
condition, but also related to how early boot messaging and framebuffer 
ownership (e.g. Plymouth or silent boot) interact with SDDM and the 
proprietary NVIDIA driver. The problem appears to be timing-sensitive 
and possibly framebuffer-related, especially in live-build-installed 
systems with newer NVIDIA GPUs.

Best regards!