Nixos setup for XPS machine

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
    ];

  nixpkgs.config.allowUnfree = true;

  # Use the systemd-boot EFI boot loader.
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  # grub
  boot.loader.grub = {
    enable = true;
    version = 2;
    efiSupport = true;
    enableCryptodisk = true;
    device = "nodev";
  };

  # luks
  boot.initrd.luks.devices = {
    crypted = {
      device = "/dev/disk/by-uuid/c6793bb6-0dd0-4cb6-b171-4c802e2c862d";
      preLVM = true;
    };
  };

  boot.kernelModules = [ "kvm-intel" ];
  boot.kernelParams = [ 
    "pcie.aspm=force"
    "i915.enable_fbc=1"
    "i915.enable_rc6=7"
    "i915.lvds_downclock=1"
    "i915.enable_guc_loading=1"
    "i915.enable_guc_submission=1"
    "i915.enable_psr=0"
  ];

  boot.kernelPackages = pkgs.linuxPackages_latest;
  boot.extraModulePackages = [ config.boot.kernelPackages.nvidia_x11 ];

  # FS options
  fileSystems."/".options = [ "noatime" "nodiratime" "discard" ];
  
  networking.hostName = "anferneepc"; # Define your hostname.
  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
  networking.networkmanager.enable = true;
  #networking.wireless.networks.Wifi_name.

  # The global useDHCP flag is deprecated, therefore explicitly set to false here.
  # Per-interface useDHCP will be mandatory in the future, so this generated config
  # replicates the default behaviour.
  networking.useDHCP = false;
  networking.interfaces.wlp58s0.useDHCP = true;

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

  # Select internationalisation properties.
  # i18n.defaultLocale = "en_US.UTF-8";
  # console = {
  #   font = "Lat2-Terminus16";
  #   keyMap = "us";
  # };

  # Set your time zone.
  time.timeZone = "America/New_York";

  # Set up DWM
  nixpkgs.config.packageOverrides = pkgs: {
    dwm = pkgs.dwm.overrideAttrs (_: {
	  src = builtins.fetchGit {
	    url = "https://github.com/ajpen/dwm";
		ref = "master";
	  };
	}); 
  };


 # List packages installed in system profile. To search, run:
 # $ nix search wget
  environment.systemPackages = with pkgs; [
    wget 
	vim 
    dmenu 
	rxvt_unicode 
	st 
	firefox 
	arandr 
	git 
	inconsolata 
	dwm
	feh
  ];

  
  # Use our custom built dwm
  services.xserver.desktopManager.session =
	[{ 
		name = "dwm";
		start = ''
		  feh --bg-scale /home/anfernee/Pictures/vaporwstore.jpg
		  /run/current-system/sw/bin/dwm &
		  waitPID=$!
		'';
	  }
    ];

  # 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;
  #   pinentryFlavor = "gnome3";
  # };

  # 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;

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

  # Enable sound.
  sound.enable = true;
  hardware.pulseaudio.enable = true;

  # boot.extraModprobeConfig = ''
  #  options snd slots=snd-hda-intel
  # '';
  # Enable the X11 windowing system.
  services.xserver.enable = true;
  # services.xserver.layout = "us";
  # services.xserver.xkbOptions = "eurosign:e";

  # Enable touchpad support.
   services.xserver.libinput.enable = true;

  services.xserver.displayManager.lightdm.enable = true;

  # Define a user account. Don't forget to set a password with ‘passwd’.
  users.users.anfernee = {
    isNormalUser = true;
    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
  };

  # Environment variables
  environment.variables.EDITOR = "vim";

  # 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 = "20.03"; # Did you read the comment?
}