feat: idols-ai - use intel intel iGPU by default, choose Nvidia dGPU manullay - via prime (#258)

* feat: idols-ai - use intel intel iGPU by default, choose Nvidia dGPU manullay - via prime

* fix: niri - update output names for new motherboard

* fix: niri - DP-1 with prime offload mode - supports only 120HZ

* flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs-master':
    'github:nixos/nixpkgs/3879e47ce293fb2932d656aa56551a8e80718533?narHash=sha256-siN4x7y/S0FOdjPC1W0Z/vrX4Rlu%2BVClkEGngmSd0vM%3D' (2026-03-24)
  → 'github:nixos/nixpkgs/03de9fe87cb2dcec8da9dbaa3ad1c71ea7fef223?narHash=sha256-B7GmxbRADkklyXzV1ahgY4QhCpbQ3crzPCCs2hf6bPM%3D' (2026-04-26)

* flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs-stable':
    'github:nixos/nixpkgs/e9f278faa1d0c2fc835bd331d4666b59b505a410?narHash=sha256-Jms57zzlFf64ayKzzBWSE2SGvJmK%2BNGt8Gli71d9kmY%3D' (2026-03-14)
  → 'github:nixos/nixpkgs/a4bf06618f0b5ee50f14ed8f0da77d34ecc19160?narHash=sha256-AIiMJiqvGrN4HyLEbKAoCSRRYn0rnlW5VbKNIMIYqm4%3D' (2026-04-25)

flake.lock

@@ -880,11 +880,11 @@
     },
     "nixpkgs-master": {
       "locked": {
-        "lastModified": 1774325747,
+        "lastModified": 1777221542,
-        "narHash": "sha256-siN4x7y/S0FOdjPC1W0Z/vrX4Rlu+VClkEGngmSd0vM=",
+        "narHash": "sha256-B7GmxbRADkklyXzV1ahgY4QhCpbQ3crzPCCs2hf6bPM=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "3879e47ce293fb2932d656aa56551a8e80718533",
+        "rev": "03de9fe87cb2dcec8da9dbaa3ad1c71ea7fef223",
         "type": "github"
       },
       "original": {
@@ -912,11 +912,11 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1773524153,
+        "lastModified": 1777077449,
-        "narHash": "sha256-Jms57zzlFf64ayKzzBWSE2SGvJmK+NGt8Gli71d9kmY=",
+        "narHash": "sha256-AIiMJiqvGrN4HyLEbKAoCSRRYn0rnlW5VbKNIMIYqm4=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "e9f278faa1d0c2fc835bd331d4666b59b505a410",
+        "rev": "a4bf06618f0b5ee50f14ed8f0da77d34ecc19160",
         "type": "github"
       },
       "original": {

hosts/idols-ai/default.nix

@@ -27,11 +27,14 @@ in
 
     # Include the results of the hardware scan.
     ./hardware-configuration.nix
-    ./nvidia.nix
+    ./hardware-intel.nix
-    ./ai
+    ./hardware-nvidia.nix
 
     ./preservation.nix
     ./secureboot.nix
+
+    # others
+    ./ai
   ];
 
   # Zram consumes physical memory for compression, which can cause a deadlock and system hang if the model size approaches the physical memory limit.

hosts/idols-ai/hardware-configuration.nix

@@ -51,10 +51,6 @@
     "usb_storage"
     "sd_mod"
   ];
-  boot.initrd.kernelModules = [ ];
-  boot.kernelModules = [ "kvm-intel" ]; # kvm virtualization support
-  boot.extraModprobeConfig = "options kvm_intel nested=1"; # for intel cpu
-  boot.extraModulePackages = [ ];
   # clear /tmp on boot to get a stateless /tmp directory.
   boot.tmp.cleanOnBoot = true;
 

hosts/idols-ai/hardware-intel.nix

@@ -0,0 +1,48 @@
+{
+  pkgs,
+  modulesPath,
+  ...
+}:
+{
+
+  imports = [
+    (modulesPath + "/hardware/cpu/intel-npu.nix")
+  ];
+
+  # Intel NPU support
+  hardware.cpu.intel.npu.enable = true;
+
+  # kvm virtualization support
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModprobeConfig = "options kvm_intel nested=1";
+  boot.extraModulePackages = [ ];
+
+  # Intel Graphics
+  # https://wiki.nixos.org/wiki/Intel_Graphics
+
+  services.xserver.videoDrivers = [ "modesetting" ];
+
+  hardware.graphics = {
+    enable = true;
+    extraPackages = with pkgs; [
+      # Required for modern Intel GPUs (Xe iGPU and ARC)
+      intel-media-driver # VA-API (iHD) userspace
+      vpl-gpu-rt # oneVPL (QSV) runtime
+
+      # Optional (compute / tooling):
+      intel-compute-runtime # OpenCL (NEO) + Level Zero for Arc/Xe
+    ];
+  };
+
+  environment.sessionVariables = {
+    LIBVA_DRIVER_NAME = "iHD"; # Prefer the modern iHD backend
+  };
+
+  # May help if FFmpeg/VAAPI/QSV init fails (esp. on Arc with i915):
+  hardware.enableRedistributableFirmware = true;
+  boot.kernelParams = [ "i915.enable_guc=3" ];
+
+  # May help services that have trouble accessing /dev/dri (e.g., jellyfin/plex):
+  # users.users.<service>.extraGroups = [ "video" "render" ];
+}

hosts/idols-ai/hardware-nvidia.nix

@@ -11,12 +11,22 @@
   # https://wiki.hyprland.org/Nvidia/
   # ===============================================================================================
 
+  # Hybrid graphics with PRIME[integrated GPU (iGPU) + dedicated GPU (dGPU)]
+  hardware.nvidia.prime = {
+    # puts dGPU(Nvidia) to sleep and lets the iGPU handle all tasks by default.
+    offload.enable = true;
+
+    intelBusId = "PCI:0@0:2:0";
+    nvidiaBusId = "PCI:2@0:0:0";
+  };
+
   boot.kernelParams = [
     # Since NVIDIA does not load kernel mode setting by default,
     # enabling it is required to make Wayland compositors function properly.
     "nvidia-drm.fbdev=1"
   ];
   services.xserver.videoDrivers = [ "nvidia" ]; # will install nvidia-vaapi-driver by default
+
   hardware.nvidia = {
     # Open-source kernel modules are preferred over and planned to steadily replace proprietary modules
     open = true;
@@ -43,14 +53,6 @@
     enable32Bit = true;
   };
 
-  nixpkgs.overlays = [
-    (_: super: {
-      # ffmpeg-full = super.ffmpeg-full.override {
-      #   withNvcodec = true;
-      # };
-    })
-  ];
-
   services.sunshine.settings = {
     max_bitrate = 20000; # in Kbps
     # NVIDIA NVENC Encoder

hosts/idols-ai/niri-hardware.kdl

@@ -1,5 +1,5 @@
 // running `niri msg outputs` to find outputs
-output "DP-2" {
+output "DP-1" {
     // Uncomment this line to disable this output.
     // off
 
@@ -16,7 +16,7 @@ output "DP-2" {
     // for the resolution.
     // If the mode is omitted altogether or is invalid, niri will pick one automatically.
     // Run `niri msg outputs` while inside a niri instance to list all outputs and their modes.
-    mode "3840x2160@144"
+    mode "3840x2160@120"
 
     // Position of the output in the global coordinate space.
     // This affects directional monitor actions like "focus-monitor-left", and cursor movement.
@@ -30,7 +30,7 @@ output "DP-2" {
     position x=0 y=0
 }
 
-output "HDMI-A-1" {
+output "HDMI-A-2" {
     scale 1.5
     transform "normal"
     mode "3840x2160@60"
@@ -38,14 +38,14 @@ output "HDMI-A-1" {
 }
 
 // ============= Named Workspaces =============
-workspace "2browser" { open-on-output "DP-2"; }
+workspace "2browser" { open-on-output "DP-1"; }
-workspace "4gaming" { open-on-output "DP-2"; }
+workspace "4gaming" { open-on-output "DP-1"; }
-workspace "5music" { open-on-output "DP-2"; }
+workspace "5music" { open-on-output "DP-1"; }
 
-workspace "1terminal" { open-on-output "HDMI-A-1"; }
+workspace "1terminal" { open-on-output "HDMI-A-2"; }
-workspace "3chat" { open-on-output "HDMI-A-1"; }
+workspace "3chat" { open-on-output "HDMI-A-2"; }
-workspace "6file" { open-on-output "HDMI-A-1"; }
+workspace "6file" { open-on-output "HDMI-A-2"; }
-workspace "7" { open-on-output "HDMI-A-1"; }
+workspace "7" { open-on-output "HDMI-A-2"; }
-workspace "8" { open-on-output "HDMI-A-1"; }
+workspace "8" { open-on-output "HDMI-A-2"; }
-workspace "9" { open-on-output "HDMI-A-1"; }
+workspace "9" { open-on-output "HDMI-A-2"; }
-workspace "0other" { open-on-output "HDMI-A-1"; }
+workspace "0other" { open-on-output "HDMI-A-2"; }