diff --git a/src/radeon_bios.c b/src/radeon_bios.c
index aec55b7..c723053 100644
--- a/src/radeon_bios.c
+++ b/src/radeon_bios.c
@@ -119,7 +119,7 @@ Bool RADEONGetConnectorInfoFromBIOS (Scr
 
     if (info->IsAtomBios) {
 	if((tmp = RADEON_BIOS16 (info->MasterDataStart + 22))) {
-	    int crtc = 0, id[2];
+	    int crtc = 0, id[2], ddc = 0;
 	    tmp1 = RADEON_BIOS16 (tmp + 4);
 	    for (i=0; i<8; i++) {
 		if(tmp1 & (1<<i)) {
@@ -129,7 +129,7 @@ Bool RADEONGetConnectorInfoFromBIOS (Scr
 
 			if (crtc == 1) {
 			    /* sharing same port with id[0] */
-			    if (((portinfo>>8) & 0xf) == id[0]) {
+			    if (((portinfo>>12) & 0xf) == id[0]) {
 				if (i == 3) 
 				    pRADEONEnt->PortInfo[0].TMDSType = TMDS_INT;
 				else if (i == 7)
@@ -141,7 +141,8 @@ Bool RADEONGetConnectorInfoFromBIOS (Scr
 			    }
 			}
 
-			id[crtc] = (portinfo>>8) & 0xf; 
+			id[crtc] = (portinfo>>12) & 0xf; 
+			ddc = (portinfo >> 8) & 0xf;
 			pRADEONEnt->PortInfo[crtc].DACType = (portinfo & 0xf) - 1;
 			pRADEONEnt->PortInfo[crtc].ConnectorType = (portinfo>>4) & 0xf;
 			if (i == 3) 
@@ -150,7 +151,7 @@ Bool RADEONGetConnectorInfoFromBIOS (Scr
 			    pRADEONEnt->PortInfo[crtc].TMDSType = TMDS_EXT;
 			
 			if((tmp0 = RADEON_BIOS16 (info->MasterDataStart + 24)) && id[crtc]) {
-			    switch (RADEON_BIOS16 (tmp0 + 4 + 27 * id[crtc]) * 4) 
+			    switch (RADEON_BIOS16 (tmp0 + 4 + 27 * ddc) * 4) 
 			    {
 			    case RADEON_GPIO_MONID:
 				pRADEONEnt->PortInfo[crtc].DDCType = DDC_MONID;
@@ -178,7 +179,7 @@ Bool RADEONGetConnectorInfoFromBIOS (Scr
 			 * port with the existing connector, fill in them accordingly.
 			 */
 			for (j=0; j<2; j++) {
-			    if (((portinfo>>8) & 0xf) == id[j]) {
+			    if (((portinfo>>12) & 0xf) == id[j]) {
 				if (i == 3) 
 				    pRADEONEnt->PortInfo[j].TMDSType = TMDS_INT;
 				else if (i == 7)