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[m1st0 <2115336@xxxxxxxxxxxxxxxxxx>]

Here is more information.  I am moving this away from dracut since it
isn't a matter of that system failing against Nvidia setup cases that
affect SDDM on my older laptop MSI Optimus laptop.

Even if I place /etc/modprobe.d/blacklist-nvidia.conf
blacklist nvidia
blacklist nvidia-drm
blacklist nvidia-modeset
blacklist nvidia-uvm
blacklist nouveau

Things were not working out for this old Optimus laptop since it would
try to load the modules causing SDDM to fail. Maybe I should make it an
SDDM issue instead?

Anyway, if you install the following packages as I like to load the
nvidia modules dynamically from a script

> linux-modules-nvidia-570-6.14.0-22-generic 6.14.0-22.22 amd64 Linux kernel nvidia modules for version 6.14.0-22
> linux-objects-nvidia-570-6.14.0-22-generic 6.14.0-22.22 amd64 Linux kernel nvidia modules for version 6.14.0-22 (objects)
> linux-signatures-nvidia-6.14.0-22-generic 6.14.0-22.22 amd64 Linux kernel signatures for nvidia modules for version 6.14.0-22-generic

It leaves SDDM to fail to boot using i815 and Nvidia trying to take
over. I literally couldn't figure out why SDDM was still failing.

I ran lsmod | grep nvidia|nouveau and of course the modules were loading regardless of the blacklist script.  I also had in /etc/default/grub
GRUB_CMDLINE_LINUX="nogpumanager modprobe.blacklist=nouveau,nvidia,nvidiafb,nvidia-uvm,nvidia-drm,nvidia-modeset

and ran the grub2 update but still found SDDM failing to load with
issues of permissions and the modules mentioned of nvidia being loaded.

I finally masked the following files from these packages
> nvidia-kernel-common-570: /lib/systemd/system/nvidia-powerd.service
> nvidia-compute-utils-570: /usr/lib/systemd/system/nvidia-persistenced.service

And now finally, I have a SDDM that boots properly.  I can load/unload
nvidia modules easily and run software using custom scripts such as
https://gist.github.com/m1st0/e6348a7ef50d5e17d41485fdac9292f3 .

In summary, you need the blacklist files in /etc/modprobe.d , systemctl
mask those services I mentioned, and the kernel options in
/etc/default/grub and update-initramfs. SDDM will boot to i915 Intel
graphics as needed thereby.


** Package changed: dracut (Ubuntu) => nvidia-kernel-common (Ubuntu)

** Summary changed:

- Grub Won't Boot After Dracut Failure
+ SDDM Won't Boot After Nvidia Setup

-- 
You received this bug notification because you are a member of
Debcrafters packages, which is subscribed to dracut in Ubuntu.
https://bugs.launchpad.net/bugs/2115336

Title:
  SDDM Won't Boot After Nvidia Setup

Status in nvidia-kernel-common package in Ubuntu:
  New

Bug description:
  Description:    Ubuntu 25.04
  Release:        25.04

  dracut-core:
    Installed: 106-2ubuntu5
    Candidate: 106-2ubuntu5
    Version table:
   *** 106-2ubuntu5 500
          500 http://us.archive.ubuntu.com/ubuntu plucky/universe amd64 Packages
          100 /var/lib/dpkg/status

  Lets say you place a file in
   
  /etc/apt/apt.conf.d/99nvidia

  Calling a script you want to use to ensure nvidia drivers are ready
  for any new kernal install.  The apt config hook notes:

  Pkg::Post-Invoke { "/home/$USER/workspace/nvidia_module_install.zsh";
  };

  and although the zsh script fails, Grub will no longer be listed as a
  bootable entry even as dracut-core finishes with no errors.

  Understandably whatever this ZSH script does may lead you to question
  whether it is the culprit, however the focus should be on the loss of
  being able to boot if the script is simply just a failing workable
  tool.  If you want to see the script, it is at

  https://gist.github.com/m1st0/3957db900736b5a01d16b8ef1b0ddd69

  It simply installs nvidia drivers and blacklists them so that sddm can
  boot until they can be dynamically loaded when needed on certain
  laptops.  There may be work to do on the ZSH script, but it shows off
  how I think dracut-core can fail miserably leaving a system that
  cannot boot.

  I removed the hook in /etc/apt/apt.conf.d/99nvidia, and ran the following just to be sure:
  sudo update-initramfs -v -u  
  sudo grub-mkconfig -o /boot/grub/grub.cfg
  sudo grub-mkconfig -o /boot/efi/EFI/ubuntu/grub.cfg
  sudo update-grub2

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