feat: nvidia stable driver with idle reset, home-manager 26.05, python312 and ffmpeg

hardware-configuration.nix

@@ -12,7 +12,7 @@
   boot.initrd.kernelModules = [ "vfio" "vfio_pci" "vfio_iommu_type1" "ahci" ];
 
   # 2) Also load them again in the running system
-  boot.kernelModules = [ "vfio" "vfio_pci" "vfio_iommu_typoe1" "ahci" ];
+  boot.kernelModules = [ "vfio" "vfio_pci" "vfio_iommu_type1" "ahci" ];
 
   # 3) Kernel params to turn on IOMMU and bind your card to vfio-pci
   boot.kernelParams = lib.mkForce [
@@ -62,12 +62,35 @@
 
   services.xserver.videoDrivers = [ "nvidia" ];
   hardware.nvidia = {
-    package = config.boot.kernelPackages.nvidiaPackages.legacy_470;
+    package = config.boot.kernelPackages.nvidiaPackages.stable;
     modesetting.enable = true;
     powerManagement.enable = true;
     open = false; # <--- this must be false for proprietary
     nvidiaSettings = true;
+    nvidiaPersistenced = true;
   };
+
+  systemd.services.nvidia-idle-reset = {
+    description = "Reset NVIDIA clocks so idle GPU can enter low-power P8";
+    wantedBy = [ "multi-user.target" ];
+    after = [ "nvidia-persistenced.service" "systemd-udev-settle.service" ];
+    wants = [ "nvidia-persistenced.service" "systemd-udev-settle.service" ];
+
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = true;
+    };
+
+    path = [ config.boot.kernelPackages.nvidiaPackages.stable ];
+
+    script = ''
+      nvidia-smi -pm 1 || true
+      nvidia-smi --auto-boost-default=0 || true
+      nvidia-smi -rgc || true
+      nvidia-smi -rmc || true
+    '';
+  };
+
   nixpkgs.config.allowUnfree = true;
   nixpkgs.config.nvidia.acceptLicense = true;
 }