diff --git a/src/i830_hdmi.c b/src/i830_hdmi.c
index 05aa9ac..b0495cb 100644
--- a/src/i830_hdmi.c
+++ b/src/i830_hdmi.c
@@ -77,10 +77,13 @@ i830_hdmi_mode_set(xf86OutputPtr output, DisplayModePtr mode,
     uint32_t sdvox;
 
     sdvox = SDVO_ENCODING_HDMI |
-	SDVO_BORDER_ENABLE |
+	SDVO_BORDER_ENABLE ;
 	SDVO_VSYNC_ACTIVE_HIGH |
 	SDVO_HSYNC_ACTIVE_HIGH;
 
+    sdvox &= ~SDVO_HSYNC_ACTIVE_HIGH ; 
+    sdvox &= ~SDVO_VSYNC_ACTIVE_HIGH ; 
+
     if (dev_priv->has_hdmi_sink)
 	    sdvox |= SDVO_AUDIO_ENABLE;