diff --git a/src/radeon_output.c b/src/radeon_output.c
index 7d73fa8..f4c5ee8 100644
--- a/src/radeon_output.c
+++ b/src/radeon_output.c
@@ -1034,6 +1034,9 @@ radeon_detect(xf86OutputPtr output)
 	}
     }
 
+    if (radeon_output->type == OUTPUT_LVDS)
+	radeon_output->MonType = MT_NONE;
+
     radeon_bios_output_connected(output, TRUE);
 
     /* set montype so users can force outputs on even if detection fails */