diff --git a/modules/gpu/amd.nix b/modules/gpu/amd.nix
index e203f3b..db23efc 100644
--- a/modules/gpu/amd.nix
+++ b/modules/gpu/amd.nix
@@ -11,4 +11,17 @@
     radeontop
     rocm-smi
   ];
+
+  # force RGB otput for HDMI (otherwise the default is YCbCr)
+  # see https://gitlab.freedesktop.org/drm/amd/-/issues/476
+  # FIXME: remove once sayuri uses DisplayPort
+  boot.kernelPatches = [
+    {
+      name = "force-rgb";
+      patch = pkgs.fetchurl {
+        url = "https://gitlab.freedesktop.org/drm/amd/uploads/99b3664a49ec759075bde5c454e1d7c2/0001-force-rgb.patch";
+        sha256 = "03dhnlxx9vlj1x8izh3c3j4r9s75q47nx8kf6mbdxqfy3cj96mjm";
+      };
+    }
+  ];
 }