diff --git a/src/mainboard/lenovo/t420s/devicetree.cb b/src/mainboard/lenovo/t420s/devicetree.cb
index 3224322..366d36f 100644
--- a/src/mainboard/lenovo/t420s/devicetree.cb
+++ b/src/mainboard/lenovo/t420s/devicetree.cb
@@ -154,6 +154,20 @@
 					register "eventd_enable" = "0xff"
 					register "evente_enable" = "0x0d"
 				end
+				chip drivers/lenovo/hybrid_graphics
+					device pnp ff.f on end # dummy
+
+					register "detect_gpio" = "21"
+
+					register "has_panel_hybrid_gpio" = "1"
+					register "panel_hybrid_gpio" = "52"
+					register "panel_integrated_lvl" = "1"
+
+					register "has_backlight_gpio" = "0"
+					register "has_dgpu_power_gpio" = "0"
+
+					register "has_thinker1" = "1"
+				end
 			end # LPC Controller
 			device pci 1f.2 on
 				subsystemid 0x17aa 0x21d2