diff --git a/drivers/gpu/drm/nouveau/nouveau_hdmi.c b/drivers/gpu/drm/nouveau/nouveau_hdmi.c
index 59ea1c14eca0363b7f132abc4c86242e68b82e0f..c3de36384522f9668a99e6aa26fb2da39dc01dd8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_hdmi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_hdmi.c
@@ -32,7 +32,9 @@ static bool
 hdmi_sor(struct drm_encoder *encoder)
 {
 	struct drm_nouveau_private *dev_priv = encoder->dev->dev_private;
-	if (dev_priv->chipset < 0xa3)
+	if (dev_priv->chipset <  0xa3 ||
+	    dev_priv->chipset == 0xaa ||
+	    dev_priv->chipset == 0xac)
 		return false;
 	return true;
 }