diff --git a/src/mainboard/lenovo/t420/Kconfig b/src/mainboard/lenovo/t420/Kconfig
index 04233e7ef6..76690776f4 100644
--- a/src/mainboard/lenovo/t420/Kconfig
+++ b/src/mainboard/lenovo/t420/Kconfig
@@ -20,6 +20,8 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select ENABLE_VMX
 	select DRIVERS_RICOH_RCE822
 	select MAINBOARD_HAS_LPC_TPM
+	select MAINBOARD_HAS_LIBGFXINIT
+	select GFX_GMA_INTERNAL_IS_LVDS
 
 	# Workaround for EC/KBC IRQ1.
 	select SERIRQ_CONTINUOUS_MODE
diff --git a/src/mainboard/lenovo/t420/Makefile.inc b/src/mainboard/lenovo/t420/Makefile.inc
index 9eb141adc9..2dab9507f1 100644
--- a/src/mainboard/lenovo/t420/Makefile.inc
+++ b/src/mainboard/lenovo/t420/Makefile.inc
@@ -15,3 +15,5 @@
 
 smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
 romstage-y += gpio.c
+
+ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
diff --git a/src/mainboard/lenovo/t420/gma-mainboard.ads b/src/mainboard/lenovo/t420/gma-mainboard.ads
new file mode 100644
index 0000000000..736dce71e0
--- /dev/null
+++ b/src/mainboard/lenovo/t420/gma-mainboard.ads
@@ -0,0 +1,20 @@
+with HW.GFX.GMA;
+with HW.GFX.GMA.Display_Probing;
+
+use HW.GFX.GMA;
+use HW.GFX.GMA.Display_Probing;
+
+private package GMA.Mainboard is
+
+   ports : constant Port_List :=
+     (DP1,
+      DP2,
+      DP3,
+      HDMI1,
+      HDMI2,
+      HDMI3,
+      Analog,
+      Internal,
+      others => Disabled);
+
+end GMA.Mainboard;