diff --git a/src/mainboard/google/reef/dsdt.asl b/src/mainboard/google/reef/dsdt.asl
index f87b96282e..ecd44f6c92 100644
--- a/src/mainboard/google/reef/dsdt.asl
+++ b/src/mainboard/google/reef/dsdt.asl
@@ -25,6 +25,7 @@ DefinitionBlock(
 			#include <soc/intel/apollolake/acpi/northbridge.asl>
 			#include <soc/intel/apollolake/acpi/southbridge.asl>
 			#include <soc/intel/apollolake/acpi/pch_hda.asl>
+                        #include <drivers/intel/gma/acpi/default_brightness_levels.asl>
 		}
 	}
 
diff --git a/src/mainboard/google/reef/variants/baseboard/devicetree.cb b/src/mainboard/google/reef/variants/baseboard/devicetree.cb
index a1b7a4c335..9aadc9ed52 100644
--- a/src/mainboard/google/reef/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/reef/variants/baseboard/devicetree.cb
@@ -125,7 +125,9 @@ chip soc/intel/apollolake
 		device pci 00.0 on  end	# - Host Bridge
 		device pci 00.1 on  end	# - DPTF
 		device pci 00.2 on  end	# - NPK
-		device pci 02.0 on  end	# - Gen
+		device pci 02.0 on	# - Gen
+			register "gfx" = "GMA_DEFAULT_PANEL(0)"
+		end
 		device pci 03.0 on  end	# - Iunit
 		device pci 0d.0 on  end	# - P2SB
 		device pci 0d.1 on  end	# - PMC
diff --git a/src/mainboard/google/reef/variants/coral/devicetree.cb b/src/mainboard/google/reef/variants/coral/devicetree.cb
index 649293138d..e8f8cc334a 100644
--- a/src/mainboard/google/reef/variants/coral/devicetree.cb
+++ b/src/mainboard/google/reef/variants/coral/devicetree.cb
@@ -125,7 +125,9 @@ chip soc/intel/apollolake
 		device pci 00.0 on  end	# - Host Bridge
 		device pci 00.1 on  end	# - DPTF
 		device pci 00.2 on  end	# - NPK
-		device pci 02.0 on  end	# - Gen
+		device pci 02.0 on	# - Gen
+			register "gfx" = "GMA_DEFAULT_PANEL(0)"
+		end
 		device pci 03.0 on  end	# - Iunit
 		device pci 0d.0 on  end	# - P2SB
 		device pci 0d.1 on  end	# - PMC
diff --git a/src/mainboard/google/reef/variants/pyro/devicetree.cb b/src/mainboard/google/reef/variants/pyro/devicetree.cb
index 0dbaa29552..af459bebef 100644
--- a/src/mainboard/google/reef/variants/pyro/devicetree.cb
+++ b/src/mainboard/google/reef/variants/pyro/devicetree.cb
@@ -134,7 +134,9 @@ chip soc/intel/apollolake
 		device pci 00.0 on  end	# - Host Bridge
 		device pci 00.1 on  end	# - DPTF
 		device pci 00.2 on  end	# - NPK
-		device pci 02.0 on  end	# - Gen
+		device pci 02.0 on	# - Gen
+			register "gfx" = "GMA_DEFAULT_PANEL(0)"
+		end
 		device pci 03.0 on  end	# - Iunit
 		device pci 0d.0 on  end	# - P2SB
 		device pci 0d.1 on  end	# - PMC
diff --git a/src/mainboard/google/reef/variants/sand/devicetree.cb b/src/mainboard/google/reef/variants/sand/devicetree.cb
index ba19369f18..91555ad6c8 100644
--- a/src/mainboard/google/reef/variants/sand/devicetree.cb
+++ b/src/mainboard/google/reef/variants/sand/devicetree.cb
@@ -121,7 +121,9 @@ chip soc/intel/apollolake
 		device pci 00.0 on  end	# - Host Bridge
 		device pci 00.1 on  end	# - DPTF
 		device pci 00.2 on  end	# - NPK
-		device pci 02.0 on  end	# - Gen
+		device pci 02.0 on	# - Gen
+			register "gfx" = "GMA_DEFAULT_PANEL(0)"
+		end
 		device pci 03.0 on  end	# - Iunit
 		device pci 0d.0 on  end	# - P2SB
 		device pci 0d.1 on  end	# - PMC
diff --git a/src/mainboard/google/reef/variants/snappy/devicetree.cb b/src/mainboard/google/reef/variants/snappy/devicetree.cb
index 3be68ddb5c..d4e9705fc3 100644
--- a/src/mainboard/google/reef/variants/snappy/devicetree.cb
+++ b/src/mainboard/google/reef/variants/snappy/devicetree.cb
@@ -130,7 +130,9 @@ chip soc/intel/apollolake
 		device pci 00.0 on  end	# - Host Bridge
 		device pci 00.1 on  end	# - DPTF
 		device pci 00.2 on  end	# - NPK
-		device pci 02.0 on  end	# - Gen
+		device pci 02.0 on	# - Gen
+			register "gfx" = "GMA_DEFAULT_PANEL(0)"
+		end
 		device pci 03.0 on  end	# - Iunit
 		device pci 0d.0 on  end	# - P2SB
 		device pci 0d.1 on  end	# - PMC