Unable to boot to plasma when using Nvidia

Help
1

Hello,
A few days ago I installed NixOS on my laptop. I set up everything except Nvidia drivers. When I decided to try them out I put the needed lines in my configuration.nix and reboot. When I rebooted I got dark screen whit that line in the top left. I can go to tty2 using ctrl+alt+F2, login and type startx but it seems like it doesn’t work. I the past I’ve had the same issue with other Linux distro so I decided to try to fix it as I did in that distro. I changed the display manager from SDDM to LightDM. It didn’t work here though.

My cofiguration can be found here
Later today I am going to upload a video of the reboot process.

Edit I am not that good in using Linux so I don’t know what logs or other stuff to provide.

Thanks in advance!

2

Not familiar with LightDM, but here are all of its options
https://search.nixos.org/options?channel=21.05&from=0&size=50&sort=relevance&type=packages&query=services.xserver.displayManager.lightdm
Maybe try to remember what lightdm config did you put and put it in the nixos options

3

Use journalctl to check your Xorg logs for a line with (EE) in it

journalctl -xe --unit display-manager IIRC

4

Thanks to everyone who replied! I have decided to go to Arch for now because this distro is kind of hard for me to understend at my current level of knowage altough I have the same issue there… It seems like it is something wrong with my laptop.
Thanks again!

5

I am having this same issue now, does anyone know of a possible solution?

6

It’s a bit hard to help without knowing your configuration, and I’m not a Nix expert, but I ran into an issue booting Plasma with Nvidia after I had to change some environment variables in my configuration.nix because I also installed Hyprland. Changing them back seems to have helped.

Currently, KDE Plasma and Hyprland both boot with SDDM and the following for my Nvidia config:

services.xserver.videoDrivers = [ “nvidia” ];
hardware.nvidia = {
modesetting.enable = true;
open = true;
nvidiaSettings = true;
};
boot.blacklistedKernelModules = [ “nouveau” ];

7

I have barely changed the default config, I just added these lines for nvidia drivers

  ### Nvidia Drivers
  # Make sure opengl is enabled
  hardware.opengl = {
    enable = true;
    driSupport = true;
    driSupport32Bit = true;
  };

  # Tell Xorg to use the nvidia driver (also valid for Wayland)
  services.xserver.videoDrivers = ["nvidia"];

  hardware.nvidia = {

    # Modesetting is needed for most Wayland compositors
    modesetting.enable = true;

    # Use the open source version of the kernel module
    # Only available on driver 515.43.04+
    open = false;

    # Enable the nvidia settings menu
    nvidiaSettings = true;

    # Optionally, you may need to select the appropriate driver version for your specific GPU.
    package = config.boot.kernelPackages.nvidiaPackages.production;
  };

I have installed all apps through home-manager.
I alsio have just tried your config, it didnt help.