NVIDIA Open 610.43.02 causes boot hang unless nvidia_drm.modeset=0 (Gigabyte G5 KF5, RTX 4060 Laptop)

Issues & Assistance
1

Hardware:

  • Laptop: Gigabyte G5 KF5
  • GPU: NVIDIA GeForce RTX 4060 Laptop + Intel Iris Xe (Optimus)

Software:

  • CachyOS
  • KDE Plasma (Wayland)
  • linux-cachyos 7.0.12-1
  • linux-cachyos-lts 6.18.35-1
  • nvidia-utils 610.43.02-3
  • linux-cachyos-nvidia-open 7.0.12-1
  • linux-cachyos-lts-nvidia-open 6.18.35-1

Problem:
After a normal shutdown, the system began hanging during boot. The boot spinner never finishes.

What I tested:

  • Reinstalled NVIDIA packages.
  • Rebuilt initramfs.
  • Tested both linux-cachyos and linux-cachyos-lts.
  • Secure Boot is disabled.
  • Package integrity is clean (pacman -Qkk).
  • Filesystem appears healthy.
  • Boot succeeds every time if I blacklist:
    module_blacklist=nvidia,nvidia_drm,nvidia_modeset,nvidia_uvm

Important discovery:
If I boot with:

nvidia_drm.modeset=0

the system boots normally.

With nvidia_drm.modeset=0:

  • nvidia-smi works correctly.
  • The RTX 4060 is detected.
  • KDE starts normally.
  • The system uses the Intel GPU for display as expected.

Relevant log message:
nvidia 0000:01:00.0: [drm] Cannot find any crtc or sizes

Bug report logs:

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