My setup looks essentially like this:

{
  # Enable the KDE Plasma Desktop Environment.
  services.displayManager = {
    plasma-login-manager = {
      enable = true;
    };
    autoLogin.enable = false;
  };
  services.desktopManager.plasma6.enable = true;

  environment.systemPackages = [
    # provide onscreen keyboard
    pkgs.kdePackages.plasma-keyboard
  ];

  programs.kdeconnect = {
    enable = true;
  };
}

Uhh Plasma Login Manager doesnt have their PAM Files right? I want to unlock my kwallet after autologin with plasma-login-manager, its a blowfish default kdewallet with my login password and I set this in ym configs:

Relevant config:

services.displayManager.plasma-login-manager.enable = true;

security.pam.services.plasma-login-manager.kwallet = {
enable = true;
package = pkgs.kdePackages.kwallet-pam;
};

Autologin:

services.displayManager.autoLogin = {
enable = true;
user = "hadichokr";
};

Overlay removing the kwallet portal service (to avoid portal issues):

(self: super: {
kdePackages = super.kdePackages // {
kwallet = super.kdePackages.kwallet.overrideAttrs (old: {
postFixup = (old.postFixup or "") + ''
rm -f $out/share/org.freedesktop.impl.portal.desktop.kwallet.service
'';
});
};
})