diff --git a/src/mainboard/lenovo/t400/dsdt.asl b/src/mainboard/lenovo/t400/dsdt.asl
index 6ba4774796..c9f4c084c4 100644
--- a/src/mainboard/lenovo/t400/dsdt.asl
+++ b/src/mainboard/lenovo/t400/dsdt.asl
@@ -18,7 +18,6 @@
 #define BRIGHTNESS_UP \_SB.PCI0.GFX0.INCB
 #define BRIGHTNESS_DOWN \_SB.PCI0.GFX0.DECB
 #define ACPI_VIDEO_DEVICE \_SB.PCI0.GFX0
-#define DISPLAY_DEVICE_2_IS_LCD_SCREEN 1
 
 DefinitionBlock(
 	"dsdt.aml",
diff --git a/src/mainboard/lenovo/x200/dsdt.asl b/src/mainboard/lenovo/x200/dsdt.asl
index 5452fe3664..42fcab3a85 100644
--- a/src/mainboard/lenovo/x200/dsdt.asl
+++ b/src/mainboard/lenovo/x200/dsdt.asl
@@ -18,7 +18,6 @@
 #define BRIGHTNESS_UP \_SB.PCI0.GFX0.INCB
 #define BRIGHTNESS_DOWN \_SB.PCI0.GFX0.DECB
 #define ACPI_VIDEO_DEVICE \_SB.PCI0.GFX0
-#define DISPLAY_DEVICE_2_IS_LCD_SCREEN 1
 
 DefinitionBlock(
 	"dsdt.aml",
diff --git a/src/mainboard/roda/rk9/dsdt.asl b/src/mainboard/roda/rk9/dsdt.asl
index 5c5ca2fda4..dee3cf4f0a 100644
--- a/src/mainboard/roda/rk9/dsdt.asl
+++ b/src/mainboard/roda/rk9/dsdt.asl
@@ -14,8 +14,6 @@
  * GNU General Public License for more details.
  */
 
-#define DISPLAY_DEVICE_2_IS_LCD_SCREEN 1
-
 DefinitionBlock(
 	"dsdt.aml",
 	"DSDT",