athenix/hw/nix-laptop.nix

# ============================================================================
# Laptop Configuration
# ============================================================================
# Hardware and boot configuration for laptop systems with mobile features.
# Includes power management, lid switch handling, and Intel graphics fixes.

{
  config,
  lib,
  modulesPath,
  ...
}:

with lib;

let
  cfg = config.athenix.hw.nix-laptop;
in
{
  imports = [
    (modulesPath + "/installer/scan/not-detected.nix")
  ];

  options.athenix.hw.nix-laptop = mkOption {
    type = types.submodule {
      options = {
        enable = mkOption {
          type = types.bool;
          default = false;
          description = "Enable laptop hardware configuration with power management.";
        };
      };
    };
    default = { };
    description = "Laptop hardware type configuration.";
  };

  config = mkIf cfg.enable {
    # ========== Boot Configuration ==========

    boot.initrd.availableKernelModules = [
      "xhci_pci" # USB 3.0 support
      "thunderbolt" # Thunderbolt support
      "nvme" # NVMe SSD support
      "usb_storage" # USB storage devices
      "sd_mod" # SD card support
      "sdhci_pci" # SD card host controller
    ];
    boot.initrd.kernelModules = [ ];
    boot.kernelModules = [ "kvm-intel" ]; # Intel virtualization support
    boot.extraModulePackages = [ ];
    boot.kernelParams = [
      "quiet" # Minimal boot messages
      "splash" # Show Plymouth boot splash
      "boot.shell_on_fail" # Emergency shell on boot failure
      "udev.log_priority=3" # Reduce udev logging
      "rd.systemd.show_status=auto" # Show systemd status during boot
      "i915.enable_psr=0" # Disable Panel Self Refresh (stability)
      "i915.enable_dc=0" # Disable display power saving
      "i915.enable_fbc=0" # Disable framebuffer compression
      "mem_sleep_default=deep" # Use deep sleep (S3) by default
    ];

    # ========== Hardware Configuration ==========
    nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
    hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;

    # ========== Filesystem Configuration ==========
    athenix.host.filesystem.device = lib.mkDefault "/dev/nvme0n1";
    athenix.host.filesystem.swapSize = lib.mkDefault "34G"; # Larger swap for hibernation
    boot.resumeDevice = "/dev/nvme0n1p2"; # Resume from swap partition
    athenix.host.buildMethods = lib.mkDefault [ "installer-iso" ];

    # ========== Power Management ==========
    systemd.sleep.extraConfig = ''
      SuspendState=mem
      HibernateDelaySec=30m
    '';
    powerManagement.enable = lib.mkDefault true;
    powerManagement.powertop.enable = lib.mkDefault true;
    services = {
      upower.enable = lib.mkDefault true;
      logind.settings = {
        Login = {
          HandleLidSwitch = "suspend";
          HandleLidSwitchExternalPower = "suspend";
          HandleLidSwitchDocked = "ignore";
          PowerKey = "hibernate";
          PowerKeyLongPress = "poweroff";
        };
      };
      power-profiles-daemon.enable = false;
      tlp = {
        enable = true;
        settings = {
          CPU_SCALING_GOVERNOR_ON_AC = "performance";
          CPU_SCALING_GOVERNOR_ON_BAT = "powersave";

          CPU_ENERGY_PERF_POLICY_ON_BAT = "power";
          CPU_ENERGY_PERF_POLICY_ON_AC = "performance";

          CPU_MIN_PERF_ON_AC = 0;
          CPU_MAX_PERF_ON_AC = 100;
          CPU_MIN_PERF_ON_BAT = 0;
          CPU_MAX_PERF_ON_BAT = 20;

          #Optional helps save long term battery health
          START_CHARGE_THRESH_BAT0 = 40; # 40 and below it starts to charge
          STOP_CHARGE_THRESH_BAT0 = 80; # 80 and above it stops charging
        };
      };
      auto-cpufreq = {
        enable = lib.mkDefault true;
        settings = {
          battery = {
            governor = "powersave";
            turbo = "never";
          };
          charger = {
            governor = "performance";
            turbo = "auto";
          };
        };
      };
    };

    athenix.sw.enable = lib.mkDefault true;
    athenix.sw.desktop.enable = lib.mkDefault true;
  };
}