diff --git a/NixOS.md b/NixOS.md
index 565fb9d..7750bb4 100644
--- a/NixOS.md
+++ b/NixOS.md
@@ -676,7 +676,7 @@ Usually most of this should work out of the box on NixOS.
 Vulkan:
 - Verification:
   - If `vulkaninfo` returns information about your GPU, Vulkan is working. https://wiki.archlinux.org/title/Vulkan#Verification
-  - If running `vkcube` (X11) or `vkcube-wayland` (Wayland) views a spinning 3D cube
+  - Run `vkcube` (X11) or `vkcube-wayland` (Wayland). It should view a spinning 3D cube and output e.g. `Selected GPU 0: AMD Radeon Graphics (RADV RENOIR)`
 
 OpenGL:
 - Verification: https://wiki.archlinux.org/title/OpenGL#Verification
diff --git a/hosts/yodaGaming/configuration.nix b/hosts/yodaGaming/configuration.nix
index 47e9d48..20181b0 100644
--- a/hosts/yodaGaming/configuration.nix
+++ b/hosts/yodaGaming/configuration.nix
@@ -48,11 +48,13 @@
   # BIOS
   boot.loader.grub.devices = ["/dev/disk/by-id/ata-Samsung_SSD_840_EVO_250GB_S1DBNSAF715594P"];
 
-  # Disable onboard Intel GPU
+  # Disable `i915` (onboard Intel GPU).
   #   https://github.com/NixOS/nixos-hardware/blob/master/common/gpu/intel/disable.nix
-  #   https://discourse.nixos.org/t/fully-disabling-the-nvidia-dgpu-on-an-optimus-laptop/29686/6?u=langfingaz
+  #   https://discourse.nixos.org/t/fully-disabling-the-nvidia-dgpu-on-an-optimus-laptop/29686/6
+  # Disable `radeon` so that `amdgpu` is used instead.
+  #   https://nixos.wiki/wiki/AMD_GPU#Enable_Southern_Islands_.28SI.29_and_Sea_Islands_.28CIK.29_support
   boot.blacklistedKernelModules = [ "i915" ];
-  boot.kernelParams = [ "i915.modeset=0" ];
+  boot.kernelParams = [ "i915.modeset=0" "radeon.si_support=0" "amdgpu.si_support=1" ];
 
 
   # List all available kernel versions: