feat(hosts/orion): enable iwlwifi power save

We setup a custom `steam.desktop` entry for our applications that makes
Steam run on the Nvidia graphics card. As a consequence, all processes
launched by steam will likewise offload their graphical rendering to the
discrete graphics card as well.

hosts/orion/modules/hardware.nix

@@ -1,23 +1,36 @@
-{ pkgs, ... }:
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}:
 {
   services.xserver.videoDrivers = [ "nvidia" ];
+  environment.variables.VDPAU_DRIVER = "va_gl";
   hardware = {
     enableRedistributableFirmware = true;
     graphics = {
       enable = true;
       extraPackages = with pkgs; [
+        vpl-gpu-rt
         intel-media-driver
         intel-vaapi-driver
-        libvdpau
+        libvdpau-va-gl
+        nvidia-vaapi-driver
       ];
+      extraPackages32 = with pkgs.driversi686Linux; [ intel-vaapi-driver ];
     };
     nvidia = {
-      modesetting.enable = true;
       nvidiaSettings = true;
-      open = true;
+      package = config.boot.kernelPackages.nvidiaPackages.beta;
+      powerManagement.enable = true;
       prime = {
-        intelBusId = "PCI:0:2:0";
+        offload = {
+          enable = true;
+          enableOffloadCmd = true;
+        };
         nvidiaBusId = "PCI:1:0:0";
+        intelBusId = "PCI:0:2:0";
       };
     };
   };