enable sending the NULL packet in course of vsync for the HDMI port.
---
 src/i830_hdmi.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: xf86_video_intel/src/i830_hdmi.c
===================================================================
--- xf86_video_intel.orig/src/i830_hdmi.c	2009-09-16 16:25:16.000000000 +0800
+++ xf86_video_intel/src/i830_hdmi.c	2009-09-27 11:46:04.000000000 +0800
@@ -86,8 +86,10 @@
 	SDVO_VSYNC_ACTIVE_HIGH |
 	SDVO_HSYNC_ACTIVE_HIGH;
 
-    if (dev_priv->has_hdmi_sink)
+    if (dev_priv->has_hdmi_sink) {
 	    sdvox |= SDVO_AUDIO_ENABLE;
+	    sdvox |= SDVO_NULL_PACKETS_DURING_VSYNC;
+    }
 
     if (intel_crtc->pipe == 1)
 	sdvox |= SDVO_PIPE_B_SELECT;