diff --git a/drivers/gpu/drm/nouveau/core/subdev/fb/nv50.c b/drivers/gpu/drm/nouveau/core/subdev/fb/nv50.c
index 4150b0d..ff7a7a0 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/fb/nv50.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/fb/nv50.c
@@ -289,6 +289,13 @@ nv50_fb_init(struct nouveau_object *object)
 	if (ret)
 		return ret;
 
+	if (nv_device(priv)->chipset == 0xaa ||
+	    nv_device(priv)->chipset == 0xac) {
+		nv_mask(priv, 0x100c14, 0x00000000, 0x00000001);
+		nv_mask(priv, 0x100c14, 0x00000000, 0x00000002);
+		nv_mask(priv, 0x100c14, 0x00000000, 0x00010000);
+	}
+
 	/* Not a clue what this is exactly.  Without pointing it at a
 	 * scratch page, VRAM->GART blits with M2MF (as in DDX DFS)
 	 * cause IOMMU "read from address 0" errors (rh#561267)