NixOS config on Dell XPS 13 Plus 9320

etc-nixos

# /etc/nixos/configuration.nix
{ config, pkgs, ... }:

{
  imports =
    [ 
      ./hardware-configuration.nix
    ];

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

  networking.hostName = "ls03064"; # Define your hostname.

  networking.networkmanager.enable = true;

  # Set your time zone.
  time.timeZone = "Europe/Berlin";


  # Select internationalisation properties.
  i18n.defaultLocale = "en_US.UTF-8";

  i18n.extraLocaleSettings = {
    LC_ADDRESS = "de_DE.UTF-8";
    LC_IDENTIFICATION = "de_DE.UTF-8";
    LC_MEASUREMENT = "de_DE.UTF-8";
    LC_MONETARY = "de_DE.UTF-8";
    LC_NAME = "de_DE.UTF-8";
    LC_NUMERIC = "de_DE.UTF-8";
    LC_PAPER = "de_DE.UTF-8";
    LC_TELEPHONE = "de_DE.UTF-8";
    LC_TIME = "de_DE.UTF-8";
  };

  # Enable the X11 windowing system.
  services.xserver.enable = true;
  # https://nixos.org/manual/nixos/stable/index.html#sec-x11--graphics-cards-intel
  services.xserver.videoDrivers = [ "intel" ];
  services.xserver.deviceSection = ''
    Option "DRI" "2"
    Option "TearFree" "true"
  '';

  services.xserver.displayManager.gdm.enable = true;
  services.xserver.desktopManager.gnome.enable = true;

  # Configure keymap in X11
  services.xserver = {
    layout = "de";
    xkbVariant = "";
  };

  console.keyMap = "de";

  services.printing.enable = true;

  # Enable sound with pipewire.
  sound.enable = true;
  hardware.pulseaudio.enable = false;
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
  };


  # for sake of ipu6-camera-bins
  nixpkgs.config.allowUnfree = true;

  users.users.<USER> = {
    isNormalUser = true;
    description = "..";
    extraGroups = [ "networkmanager" "wheel" ];

    packages = with pkgs; [
      home-manager
      # leave browsers here for sake of camera support
      firefox
      google-chrome
    ];
  };

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs; [
    file
    glxinfo
    htop
    inxi
    lshw
    openvpn
    pciutils

    # https://discourse.nixos.org/t/v4l2loopback-cannot-find-module/26301/5
    # obs-studio
    v4l-utils

    vim
  ];

  programs.vim.defaultEditor = true;

  system.stateVersion = "23.11";
}

# /etc/nixos/hardware-configuration.nix
{ config, lib, pkgs, modulesPath, ... }:

let
  ivsc-firmware = with pkgs;
    stdenv.mkDerivation rec {
      pname = "ivsc-firmware";
      version = "main";

      src = pkgs.fetchFromGitHub {
        owner = "intel";
        repo = "ivsc-firmware";
        rev = "10c214fea5560060d387fbd2fb8a1af329cb6232";
        sha256 = "sha256-kEoA0yeGXuuB+jlMIhNm+SBljH+Ru7zt3PzGb+EPBPw=";

      };

      installPhase = ''
        mkdir -p $out/lib/firmware/vsc/soc_a1_prod

        cp firmware/ivsc_pkg_ovti01a0_0.bin $out/lib/firmware/vsc/soc_a1_prod/ivsc_pkg_ovti01a0_0_a1_prod.bin
        cp firmware/ivsc_skucfg_ovti01a0_0_1.bin $out/lib/firmware/vsc/soc_a1_prod/ivsc_skucfg_ovti01a0_0_1_a1_prod.bin
        cp firmware/ivsc_fw.bin $out/lib/firmware/vsc/soc_a1_prod/ivsc_fw_a1_prod.bin
      '';
    };
in
{
  imports =
    [ (modulesPath + "/installer/scan/not-detected.nix")
    ];

  boot.initrd.availableKernelModules = [ "xhci_pci" "thunderbolt" "nvme" "usb_storage" "usbhid" "sd_mod" "i915" ];
  boot.initrd.kernelModules = [];
  boot.kernelModules = [ "kvm-intel" ];
  boot.extraModulePackages = [];

  # https://discourse.nixos.org/t/i915-driver-has-bug-for-iris-xe-graphics/25006/10
  # resolved: i915 0000:00:02.0: [drm] Selective fetch area calculation failed in pipe A
  boot.kernelParams = [
    "i915.enable_psr=0"
  ];

  fileSystems."/" =
    { device = "/dev/disk/by-uuid/5cfd71ea-6978-427b-9b10-75249bcc63ff";
      fsType = "ext4";
    };

  boot.initrd.luks.devices."luks-5f6a700d-cfdb-492c-b52d-d875e818631c".device = "/dev/disk/by-uuid/5f6a700d-cfdb-492c-b52d-d875e818631c";

  fileSystems."/boot" =
    { device = "/dev/disk/by-uuid/F642-A1B7";
      fsType = "vfat";
    };

  swapDevices = [ ];

  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
  # (the default) this is the recommended approach. When using systemd-networkd it's
  # still possible to use this option, but it's recommended to use it in conjunction
  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
  networking.useDHCP = lib.mkDefault true;
  # networking.interfaces.enp0s13f0u1u4.useDHCP = lib.mkDefault true;
  # networking.interfaces.wlp0s20f3.useDHCP = lib.mkDefault true;

  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
  powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
  # Tracking Issue: Intel MIPI/IPU6 webcam-support
  # https://github.com/NixOS/nixpkgs/issues/225743#issuecomment-1849613797
  # Infrastructure Processing Unit
  hardware.ipu6 = {
    enable = true;
    platform = "ipu6ep";
  };


  hardware.enableRedistributableFirmware = true;

  hardware.firmware = [
    ivsc-firmware
  ];


  # environment.etc.camera.source = "${ipu6-camera-hal}/share/defaults/etc/camera";
}

Awesome, it works great to have webcam! Just, it fails in cheese, but all other programs I tried get it right:

1. firefox
2. chrome
3. obs
4. zoom-us

Thank you so much. Note that to get sound right, I needed to run alsactl init.

might be cheese has a permissions issue as mentioned here

sudo cheese 

(cheese:543473): cheese-WARNING **: 09:26:02.442: Device '/dev/video1' does not support 2:0:0:0 colorimetry: ../sys/v4l2/gstv4l2object.c(4213): gst_v4l2_object_set_format_full (): /GstCameraBin:camerabin/GstWrapperCameraBinSrc:camera_source/GstBin:bin36/GstV4l2Src:v4l2src1:
Device wants 2:0:0:0 colorimetry

Without sudo see notgne2/xps_9320.nix