diff --git a/src/mainboard/google/butterfly/mainboard.c b/src/mainboard/google/butterfly/mainboard.c
index c33b9cf02b..32a830842a 100644
--- a/src/mainboard/google/butterfly/mainboard.c
+++ b/src/mainboard/google/butterfly/mainboard.c
@@ -194,7 +194,7 @@ void mainboard_suspend_resume(void)
 #if CONFIG_PCI_ROM_RUN || CONFIG_VGA_ROM_RUN
 static int int15_handler(void)
 {
-	int res = -1;
+	int res = 0;
 
 	printk(BIOS_DEBUG, "%s: INT15 function %04x!\n",
 	       __func__, X86_AX);
@@ -210,7 +210,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CL = 0x00;	/* Use video bios default */
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f35:
 		/*
@@ -226,7 +226,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0000;	/* Use video bios default */
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f51:
 		/*
@@ -238,7 +238,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0001;	/* Int-LVDS */
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f70:
 		switch (X86_CH) {
@@ -246,25 +246,25 @@ static int int15_handler(void)
 			/* Get Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 1:
 			/* Set Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 2:
 			/* Get SG/Non-SG mode */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		default:
 			/* Interrupt was not handled */
 			printk(BIOS_DEBUG, "Unknown INT15 5f70 function: 0x%02x\n",
 			       X86_CH);
-			return 0;
+			break;
 		}
 		break;
 
diff --git a/src/mainboard/google/link/mainboard.c b/src/mainboard/google/link/mainboard.c
index 01d4484103..2731df0204 100644
--- a/src/mainboard/google/link/mainboard.c
+++ b/src/mainboard/google/link/mainboard.c
@@ -64,7 +64,7 @@ void mainboard_suspend_resume(void)
 #if CONFIG_PCI_ROM_RUN || CONFIG_VGA_ROM_RUN
 static int int15_handler(void)
 {
-	int res=-1;
+	int res = 0;
 
 	printk(BIOS_DEBUG, "%s: INT15 function %04x!\n",
 			__func__, X86_AX);
@@ -80,7 +80,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CL = 0x00; /* Use video bios default */
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f35:
 		/*
@@ -96,7 +96,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0000; /* Use video bios default */
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f51:
 		/*
@@ -108,7 +108,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0003; /* eDP */
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f70:
 		switch (X86_CH) {
@@ -116,29 +116,29 @@ static int int15_handler(void)
 			/* Get Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 1:
 			/* Set Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 2:
 			/* Get SG/Non-SG mode */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		default:
 			/* Interrupt was not handled */
 			printk(BIOS_DEBUG, "Unknown INT15 5f70 function: 0x%02x\n",
 				X86_CH);
-			return 0;
+			break;
 		}
 		break;
 	case 0x5fac:
-		res = 0;
+		res = 1;
 		break;
         default:
 		printk(BIOS_DEBUG, "Unknown INT15 function %04x!\n", X86_AX);
diff --git a/src/mainboard/google/parrot/mainboard.c b/src/mainboard/google/parrot/mainboard.c
index c07d9e2348..bc505beaff 100644
--- a/src/mainboard/google/parrot/mainboard.c
+++ b/src/mainboard/google/parrot/mainboard.c
@@ -52,7 +52,7 @@ void mainboard_suspend_resume(void)
 #if CONFIG_PCI_ROM_RUN || CONFIG_VGA_ROM_RUN
 static int int15_handler(void)
 {
-	int res=-1;
+	int res = 0;
 
 	printk(BIOS_DEBUG, "%s: INT15 function %04x!\n",
 			__func__, X86_AX);
@@ -68,7 +68,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CL = 0x00; /* Use video bios default */
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f35:
 		/*
@@ -84,7 +84,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0000; /* Use video bios default */
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f51:
 		/*
@@ -96,7 +96,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0003; /* eDP */
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f70:
 		switch (X86_CH) {
@@ -104,25 +104,25 @@ static int int15_handler(void)
 			/* Get Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 1:
 			/* Set Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 2:
 			/* Get SG/Non-SG mode */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		default:
 			/* Interrupt was not handled */
 			printk(BIOS_DEBUG, "Unknown INT15 5f70 function: 0x%02x\n",
 				X86_CH);
-			return 0;
+			break;
 		}
 		break;
 
diff --git a/src/mainboard/google/slippy/mainboard.c b/src/mainboard/google/slippy/mainboard.c
index cce2260fcf..0159bd0b6c 100644
--- a/src/mainboard/google/slippy/mainboard.c
+++ b/src/mainboard/google/slippy/mainboard.c
@@ -46,7 +46,7 @@ void mainboard_suspend_resume(void)
 #if CONFIG_PCI_ROM_RUN || CONFIG_VGA_ROM_RUN
 static int int15_handler(void)
 {
-	int res=-1;
+	int res = 0;
 
 	printk(BIOS_DEBUG, "%s: AX=%04x BX=%04x CX=%04x DX=%04x\n",
 	       __func__, X86_AX, X86_BX, X86_CX, X86_DX);
@@ -62,7 +62,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0001;
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f35:
 		/*
@@ -78,7 +78,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0000;
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f51:
 		/*
@@ -90,7 +90,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0003;
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f70:
 		switch ((X86_CX >> 8) & 0xff) {
@@ -98,26 +98,26 @@ static int int15_handler(void)
 			/* Get Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 1:
 			/* Set Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 2:
 			/* Get SG/Non-SG mode */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		default:
 			/* Interrupt was not handled */
 			printk(BIOS_DEBUG,
 			       "Unknown INT15 5f70 function: 0x%02x\n",
 				((X86_CX >> 8) & 0xff));
-			return 0;
+			break;
 		}
 		break;
 
diff --git a/src/mainboard/google/stout/mainboard.c b/src/mainboard/google/stout/mainboard.c
index 62ac7ead6b..7f6b7ddd07 100644
--- a/src/mainboard/google/stout/mainboard.c
+++ b/src/mainboard/google/stout/mainboard.c
@@ -52,7 +52,7 @@ void mainboard_suspend_resume(void)
 #if CONFIG_PCI_ROM_RUN || CONFIG_VGA_ROM_RUN
 static int int15_handler(void)
 {
-	int res=-1;
+	int res = 0;
 
 	printk(BIOS_DEBUG, "%s: INT15 function %04x!\n",
 			__func__, X86_AX);
@@ -68,7 +68,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CL = 0x00; /* Use video bios default */
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f35:
 		/*
@@ -84,7 +84,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0000; /* Use video bios default */
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f51:
 		/*
@@ -96,7 +96,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0001;
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f70:
 		switch (X86_CH) {
@@ -104,25 +104,25 @@ static int int15_handler(void)
 			/* Get Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 1:
 			/* Set Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 2:
 			/* Get SG/Non-SG mode */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		default:
 			/* Interrupt was not handled */
 			printk(BIOS_DEBUG, "Unknown INT15 5f70 function: 0x%02x\n",
 				X86_CH);
-			return 0;
+			break;
 		}
 		break;
 
diff --git a/src/mainboard/intel/baskingridge/mainboard.c b/src/mainboard/intel/baskingridge/mainboard.c
index d49ba4509c..69943cb036 100644
--- a/src/mainboard/intel/baskingridge/mainboard.c
+++ b/src/mainboard/intel/baskingridge/mainboard.c
@@ -45,7 +45,7 @@ void mainboard_suspend_resume(void)
 #if CONFIG_PCI_ROM_RUN || CONFIG_VGA_ROM_RUN
 static int int15_handler(void)
 {
-	int res=-1;
+	int res = 0;
 
 	printk(BIOS_DEBUG, "%s: AX=%04x BX=%04x CX=%04x DX=%04x\n",
 	       __func__, X86_AX, X86_BX, X86_CX, X86_DX);
@@ -61,7 +61,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0001;
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f35:
 		/*
@@ -77,7 +77,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0000;
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f51:
 		/*
@@ -89,7 +89,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0003;
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f70:
 		switch ((X86_CX >> 8) & 0xff) {
@@ -97,26 +97,26 @@ static int int15_handler(void)
 			/* Get Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 1:
 			/* Set Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 2:
 			/* Get SG/Non-SG mode */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		default:
 			/* Interrupt was not handled */
 			printk(BIOS_DEBUG,
 			       "Unknown INT15 5f70 function: 0x%02x\n",
 				((X86_CX >> 8) & 0xff));
-			return 0;
+			break;
 		}
 		break;
 
diff --git a/src/mainboard/intel/wtm2/mainboard.c b/src/mainboard/intel/wtm2/mainboard.c
index d49ba4509c..e7650fa46d 100644
--- a/src/mainboard/intel/wtm2/mainboard.c
+++ b/src/mainboard/intel/wtm2/mainboard.c
@@ -45,7 +45,7 @@ void mainboard_suspend_resume(void)
 #if CONFIG_PCI_ROM_RUN || CONFIG_VGA_ROM_RUN
 static int int15_handler(void)
 {
-	int res=-1;
+	int res = 1;
 
 	printk(BIOS_DEBUG, "%s: AX=%04x BX=%04x CX=%04x DX=%04x\n",
 	       __func__, X86_AX, X86_BX, X86_CX, X86_DX);
@@ -61,7 +61,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0001;
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f35:
 		/*
@@ -77,7 +77,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0000;
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f51:
 		/*
@@ -89,7 +89,7 @@ static int int15_handler(void)
 		 */
 		X86_AX = 0x005f;
 		X86_CX = 0x0003;
-		res = 0;
+		res = 1;
 		break;
 	case 0x5f70:
 		switch ((X86_CX >> 8) & 0xff) {
@@ -97,26 +97,26 @@ static int int15_handler(void)
 			/* Get Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 1:
 			/* Set Mux */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		case 2:
 			/* Get SG/Non-SG mode */
 			X86_AX = 0x005f;
 			X86_CX = 0x0000;
-			res = 0;
+			res = 1;
 			break;
 		default:
 			/* Interrupt was not handled */
 			printk(BIOS_DEBUG,
 			       "Unknown INT15 5f70 function: 0x%02x\n",
 				((X86_CX >> 8) & 0xff));
-			return 0;
+			break;
 		}
 		break;