Update gaming configuration: remove video driver setting and add AMD Vulkan ICD variable

hosts/global/common/gaming.nix

@@ -12,8 +12,6 @@
     driSupport32Bit = true;
   };
 
-  services.xserver.videoDrivers = [ "amdgpu" ];
-
   programs = {
     steam = {
       enable = true;

hosts/nixos/rune/default.nix

@@ -66,6 +66,10 @@ in
     asdf-vm
   ];
 
+  environment.sessionVariables = {
+    AMD_VULKAN_ICD = "RADV";
+  };
+
   # https://wiki.nixos.org/wiki/FAQ/When_do_I_update_stateVersion
   system.stateVersion = "24.11";
 }

hosts/nixos/rune/hardware.nix

@@ -46,7 +46,10 @@
       ];
       kernelModules = [ ];
     };
-    kernelModules = [ "kvm-amd" ];
+    kernelModules = [
+      "kvm-amd"
+      "amdgpu"
+    ];
     extraModulePackages = [ ];
   };