diff --git a/src/i830_sdvo.c b/src/i830_sdvo.c
index 701aeaa..7be79b4 100644
--- a/src/i830_sdvo.c
+++ b/src/i830_sdvo.c
@@ -770,7 +770,7 @@ i830_sdvo_get_supp_encode(xf86OutputPtr output, struct i830_sdvo_encode *encode)
 
     i830_sdvo_write_cmd(output, SDVO_CMD_GET_SUPP_ENCODE, NULL, 0);
     status = i830_sdvo_read_response(output, encode, sizeof(*encode));
-    if (status != SDVO_CMD_STATUS_SUCCESS) {
+    if (status != SDVO_CMD_STATUS_SUCCESS) { /* non-support means DVI */
 	memset(encode, 0, sizeof(*encode));
 	return FALSE;
     }
@@ -1723,6 +1723,22 @@ i830_sdvo_select_ddc_bus(struct i830_sdvo_priv *dev_priv)
 }
 
 Bool
+i830_sdvo_get_digital_encoding_mode(xf86OutputPtr output, uint8_t *mode)
+{
+    I830OutputPrivatePtr    intel_output = output->driver_private;
+    struct i830_sdvo_priv   *dev_priv = intel_output->dev_priv;
+    uint8_t status;
+
+    i830_sdvo_set_target_output(output, dev_priv->controlled_output);
+
+    i830_sdvo_write_cmd(output, SDVO_CMD_GET_ENCODE, NULL, 0);
+    status = i830_sdvo_read_response(output, mode, 1);
+    if (status != SDVO_CMD_STATUS_SUCCESS)
+	return FALSE;
+    return TRUE;
+}
+
+Bool
 i830_sdvo_init(ScrnInfoPtr pScrn, int output_device)
 {
     xf86OutputPtr	    output;
@@ -1842,6 +1858,7 @@ i830_sdvo_init(ScrnInfoPtr pScrn, int output_device)
 
     if (dev_priv->caps.output_flags & (SDVO_OUTPUT_TMDS0 | SDVO_OUTPUT_TMDS1))
     {
+	uint8_t hdmi_mode;
 	if (dev_priv->caps.output_flags & SDVO_OUTPUT_TMDS0)
 	    dev_priv->controlled_output = SDVO_OUTPUT_TMDS0;
 	else
@@ -1849,8 +1866,9 @@ i830_sdvo_init(ScrnInfoPtr pScrn, int output_device)
         output->subpixel_order = SubPixelHorizontalRGB;
 	name_prefix="TMDS";
 
-	i830_sdvo_get_supp_encode(output, &dev_priv->encode);
-	if (dev_priv->encode.hdmi_rev != 0) {
+	if (i830_sdvo_get_supp_encode(output, &dev_priv->encode) &&
+		i830_sdvo_get_digital_encoding_mode(output, &hdmi_mode) &&
+		(hdmi_mode == 1)) {
 	    /* enable hdmi encoding mode if supported */
 	    i830_sdvo_set_encode(output, SDVO_ENCODE_HDMI);
 	    i830_sdvo_set_colorimetry(output, SDVO_COLORIMETRY_RGB256);