Login Screen for KDE is freezing up after installing Nvidia Legacy 470 Driver

I installed KDE 6 from the ISO (Plasma Desktop, 64-bit Intel/AMD). By default it installed open source Nouveau but I followed this wiki and installed non-free Nvidia drivers.

But the thing is the KDE Login screen / SDDM is badly freezing up. The mouse barely moves. I can type in the password but the cursor barely moves. How to make the login screen work normally?

This is my configuration.nix

# use nvidia drivers
# https://nixos.wiki/wiki/Nvidia

nixpkgs.config.nvidia.acceptLicense = true;

boot.extraModulePackages = [config.boot.kernelPackages.nvidiaPackages.legacy_470];

# Enable OpenGL
hardware.graphics = {
enable = true;
};

hardware.nvidia = {

# Modesetting is required.
modesetting.enable = true;

# Nvidia power management. Experimental, and can cause sleep/suspend to fail.
# Enable this if you have graphical corruption issues or application crashes after waking
# up from sleep. This fixes it by saving the entire VRAM memory to /tmp/ instead
# of just the bare essentials.
powerManagement.enable = false;

# Fine-grained power management. Turns off GPU when not in use.
# Experimental and only works on modern Nvidia GPUs (Turing or newer).
powerManagement.finegrained = false;

# Use the NVidia open source kernel module (not to be confused with the
# independent third-party "nouveau" open source driver).
# Support is limited to the Turing and later architectures. Full list of
# supported GPUs is at:
# https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus
# Only available from driver 515.43.04+
# Currently alpha-quality/buggy, so false is currently the recommended setting.
open = false;

# Enable the Nvidia settings menu,
# accessible via `nvidia-settings`.
nvidiaSettings = true;

# Optionally, you may need to select the appropriate driver version for your specific GPU.
package = config.boot.kernelPackages.nvidiaPackages.legacy_470;
};

# Load nvidia driver for Xorg and Wayland
services.xserver.videoDrivers = ["nvidia"];

# disable wayland
services.xserver.displayManager.gdm.wayland = false;

# early load nvidia modules

boot.initrd.kernelModules = [ "nvidia" "nvidia_modeset" "nvidia_drm" ];

can you pleas provide you full configuration and more infos of your system(versions, hardware…)

Full configuration.nix:

# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
    ];

  # Bootloader.
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  #kernel
  boot.kernelPackages = pkgs.linuxPackages_5_15;
  


  networking.hostName = "nixos"; # Define your hostname.
  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.

  # Configure network proxy if necessary
  # networking.proxy.default = "http://user:password@proxy:port/";
  # networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";

  # Enable networking
  networking.networkmanager.enable = true;

  # Set your time zone.
  time.timeZone = "Asia/Kolkata";

  # Select internationalisation properties.
  i18n.defaultLocale = "en_IN";

  i18n.extraLocaleSettings = {
    LC_ADDRESS = "en_IN";
    LC_IDENTIFICATION = "en_IN";
    LC_MEASUREMENT = "en_IN";
    LC_MONETARY = "en_IN";
    LC_NAME = "en_IN";
    LC_NUMERIC = "en_IN";
    LC_PAPER = "en_IN";
    LC_TELEPHONE = "en_IN";
    LC_TIME = "en_IN";
  };

  # Enable the X11 windowing system.
  # You can disable this if you're only using the Wayland session.
  services.xserver.enable = true;

  # Enable the KDE Plasma Desktop Environment.
  services.displayManager.sddm.enable = true;
  services.desktopManager.plasma6.enable = true;

  # Configure keymap in X11
  services.xserver.xkb = {
    layout = "us";
    variant = "";
  };

# use nvidia drivers
# https://nixos.wiki/wiki/Nvidia

nixpkgs.config.nvidia.acceptLicense = true;

boot.blacklistedKernelModules = [ "nouveau" ];
boot.extraModulePackages = [config.boot.kernelPackages.nvidiaPackages.legacy_470];
boot.initrd.kernelModules = [ "nvidia" "nvidia_modeset" "nvidia_drm" ];

# Enable OpenGL
hardware.graphics = {
enable = true;
};

hardware.nvidia = {

# Modesetting is required.
modesetting.enable = true;

# Nvidia power management. Experimental, and can cause sleep/suspend to fail.
# Enable this if you have graphical corruption issues or application crashes after waking
# up from sleep. This fixes it by saving the entire VRAM memory to /tmp/ instead
# of just the bare essentials.
powerManagement.enable = false;

# Fine-grained power management. Turns off GPU when not in use.
# Experimental and only works on modern Nvidia GPUs (Turing or newer).
powerManagement.finegrained = false;

# Use the NVidia open source kernel module (not to be confused with the
# independent third-party "nouveau" open source driver).
# Support is limited to the Turing and later architectures. Full list of
# supported GPUs is at:
# https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus
# Only available from driver 515.43.04+
# Currently alpha-quality/buggy, so false is currently the recommended setting.
open = false;

# Enable the Nvidia settings menu,
# accessible via `nvidia-settings`.
nvidiaSettings = true;

# Optionally, you may need to select the appropriate driver version for your specific GPU.
package = config.boot.kernelPackages.nvidiaPackages.legacy_470;
};

# Load nvidia driver for Xorg and Wayland
services.xserver.videoDrivers = ["nvidia"];

# disable wayland
services.xserver.displayManager.gdm.wayland = false;

# Enable CUPS to print documents.
services.printing.enable = true;

# Enable sound with pipewire.
hardware.pulseaudio.enable = false;
security.rtkit.enable = true;
services.pipewire = {
enable = true;
alsa.enable = true;
alsa.support32Bit = true;
pulse.enable = true;
# If you want to use JACK applications, uncomment this
#jack.enable = true;

# use the example session manager (no others are packaged yet so this is enabled by default,
# no need to redefine it in your config for now)
#media-session.enable = true;
};

# Enable touchpad support (enabled default in most desktopManager).
# services.xserver.libinput.enable = true;

# Define a user account. Don't forget to set a password with ‘passwd’.
users.users.moss = {
isNormalUser = true;
description = "moss";
extraGroups = [ "networkmanager" "wheel" ];
packages = with pkgs; [
kdePackages.kate
#  thunderbird
];
};

security.sudo.extraRules= [
{  users = [ "moss" ];
commands = [
{ command = "ALL" ;
options= [ "NOPASSWD" ]; # "SETENV" # Adding the following could be a good idea
}
];
}
];


  # Install firefox.
  programs.firefox.enable = true;

  # Allow unfree packages
  nixpkgs.config.allowUnfree = true;

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs; [
  pkgs.inxi
  pkgs.geany
  pkgs.nushell
  pkgs.doublecmd
  pkgs.vlc
  pkgs.mpvc
  pkgs.pqiv
  pkgs.chromium
  pkgs.carapace
  pkgs.dms
  pkgs.mediainfo-gui
  pkgs.ffmpeg-full
  pkgs.kitty
  pkgs.qbittorrent
  pkgs.tor-browser
  pkgs.telegram-desktop
  pkgs.pciutils
  pkgs.virtualglLib
  pkgs.zed-editor
  pkgs.vulkan-tools
  pkgs.veracrypt
  pkgs.python311
  pkgs.python311Packages.flask
  pkgs.lvm2
  pkgs.sudo
  pkgs.calibre
  pkgs.anki-bin
  pkgs.bookworm
  pkgs.jetbrains.pycharm-community-bin
  pkgs.vscode-fhs
  pkgs.kdePackages.partitionmanager
  #  vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
  wget
  ];

  # Some programs need SUID wrappers, can be configured further or are
  # started in user sessions.
  # programs.mtr.enable = true;
  # programs.gnupg.agent = {
  #   enable = true;
  #   enableSSHSupport = true;
  # };

  # List services that you want to enable:

  # Enable the OpenSSH daemon.
  # services.openssh.enable = true;

  # Open ports in the firewall.
  # networking.firewall.allowedTCPPorts = [ ... ];
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  # networking.firewall.enable = false;

  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It‘s perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "24.11"; # Did you read the comment?

}

Hardware Info:

System:
  Kernel: 5.15.177 arch: x86_64 bits: 64 compiler: gcc v: 13.3.0
  Desktop: KDE Plasma v: 6.2.5 Distro: NixOS 24.11 (Vicuna)
Machine:
  Type: Desktop System: ASUS product: N/A v: N/A serial: N/A
  Mobo: ASUSTeK model: PRIME B760M-A v: Rev 1.xx serial: <filter>
    UEFI: American Megatrends v: 1663 date: 08/08/2024
CPU:
  Info: 6-core model: 12th Gen Intel Core i5-12400F bits: 64 type: MT MCP
    arch: Alder Lake rev: 5 cache: L1: 480 KiB L2: 7.5 MiB L3: 18 MiB
  Speed (MHz): avg: 983 high: 2996 min/max: 800/5600 cores: 1: 800 2: 801
    3: 800 4: 801 5: 801 6: 801 7: 801 8: 2996 9: 801 10: 801 11: 800 12: 801
    bogomips: 59904
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: NVIDIA GK208B [GeForce GT 710] vendor: Gigabyte driver: nvidia
    v: 470.256.02 arch: Fermi 2 bus-ID: 01:00.0
  Display: unspecified server: X.org v: 1.21.1.14 with: Xwayland v: 24.1.4
    driver: gpu: nvidia,nvidia-nvswitch resolution: 1920x1080~60Hz
  API: EGL Message: No EGL data available.
  API: OpenGL v: 4.6.0 vendor: nvidia v: 470.256.02 glx-v: 1.4
    direct-render: yes renderer: NVIDIA GeForce GT 710/PCIe/SSE2
  API: Vulkan v: 1.3.296 drivers: N/A surfaces: xcb,xlib devices: 2
Audio:
  Device-1: Intel Raptor Lake High Definition Audio vendor: ASUSTeK
    driver: snd_hda_intel v: kernel bus-ID: 00:1f.3
  Device-2: NVIDIA GK208 HDMI/DP Audio vendor: Gigabyte
    driver: snd_hda_intel v: kernel bus-ID: 01:00.1
  API: ALSA v: k5.15.177 status: kernel-api
  Server-1: PipeWire v: 1.2.7 status: n/a (root, process)
  Server-2: PulseAudio v: 17.0 status: off (using pipewire-pulse)
Network:
  Device-1: Realtek RTL8125 2.5GbE vendor: ASUSTeK driver: r8169 v: kernel
    port: 4000 bus-ID: 04:00.0
  IF: enp4s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
RAID:
  Hardware-1: Intel Volume Management Device NVMe RAID Controller driver: vmd
    v: 0.6 bus-ID: 00:0e.0
Drives:
  Local Storage: total: 1.93 TiB used: 1.23 TiB (63.5%)
  ID-1: /dev/sda vendor: Seagate model: ST2000DM006-2DM164 size: 1.82 TiB
  ID-2: /dev/sdb vendor: A-Data model: SP550 size: 111.79 GiB
Partition:
  ID-1: / size: 105.63 GiB used: 41.78 GiB (39.6%) fs: ext4 dev: /dev/sdb2
  ID-2: /boot size: 3.9 GiB used: 269.9 MiB (6.8%) fs: vfat dev: /dev/sdb1
Swap:
  Alert: No swap data was found.
Sensors:
  Src: /sys System Temperatures: cpu: 44.0 C mobo: N/A gpu: nvidia temp: 44 C
  Fan Speeds (rpm): N/A gpu: nvidia fan: 33%
Info:
  Memory: total: 16 GiB available: 15.44 GiB used: 2.88 GiB (18.6%)
  Processes: 270 Uptime: 1h 30m Init: systemd
  Packages: 1453 Compilers: N/A Shell: Sudo v: 1.9.16p2 inxi: 3.3.35

Ok thanks.
Can you pleas try follwing:

services.displayManager.sddm.wayland.enable = false;

And if that does not work try this setting with true.

1 Like

This totally worked thanks!

services.displayManager.sddm.wayland.enable = false;
1 Like