Black screen at login but blind login works and the desktop session is fine

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Hi everyone. This is an AI summary of a problem that I have and all the ways i have tried to fix it.

Problem Description

After a recent update, the graphical login manager SDDM sometimes fails to appear on boot. The screen stays black with the backlight on. Interestingly, I can log in “blindly” by typing my password and pressing Enter, and then the desktop appears and works fine. The problem is intermittent and often requires several reboots to fix.

System Details

  • Laptop: Lenovo Legion Slim 5 (16APH8)
  • CPU: AMD Ryzen 7 7840HS (with iGPU)
  • GPU: NVIDIA RTX 4060 (dGPU)
  • OS: Fedora 42 with KDE Plasma
  • Display Server: Wayland
  • NVIDIA Driver: Proprietary version 580.82.09

What I’ve Tried

Based on my log analysis, it looks like a race condition where the NVIDIA driver tries to initialize the display before it can read the monitor’s information. I’ve taken the following steps to try and fix it, but the issue still happens:

  • Forced Early Loading: I added force_drivers+=" nvidia nvidia_modeset nvidia_uvm nvidia_drm " to my dracut configuration to ensure the NVIDIA modules load early in the boot process.
  • Enabled KMS: I created /etc/modprobe.d/nvidia.conf with options nvidia_drm modeset=1 to ensure Kernel Mode Setting is enabled.
  • SDDM Config: I confirmed my sddm.conf is set to use Wayland.

Well… the issue persists. Does anyone have any suggestions for a fix? Thanks in advance for the help!