diff --git a/src/mainboard/google/samus/acpi/mainboard.asl b/src/mainboard/google/samus/acpi/mainboard.asl
index 624aa3822b..3aea40c63f 100644
--- a/src/mainboard/google/samus/acpi/mainboard.asl
+++ b/src/mainboard/google/samus/acpi/mainboard.asl
@@ -50,6 +50,24 @@ Scope (\_SB)
 		Name (_UID, 2)
 		Name (_PRW, Package() { 14, 0x3 }) // GPIO14
 	}
+
+	// Keyboard Backlight interface via EC
+	Device (KBLT) {
+		Name (_HID, "GOOG0002")
+		Name (_UID, 1)
+
+		// Read current backlight value
+		Method (KBQC, 0)
+		{
+			Return (\_SB.PCI0.LPCB.EC0.KBLV)
+		}
+
+		// Write new backlight value
+		Method (KBCM, 1)
+		{
+			Store (Arg0, \_SB.PCI0.LPCB.EC0.KBLV)
+		}
+	}
 }
 
 Scope (\_SB.PCI0.I2C0)
diff --git a/src/mainboard/google/samus/romstage.c b/src/mainboard/google/samus/romstage.c
index c9e13e1dfb..d6528592e4 100644
--- a/src/mainboard/google/samus/romstage.c
+++ b/src/mainboard/google/samus/romstage.c
@@ -25,6 +25,7 @@
 #include <broadwell/gpio.h>
 #include <broadwell/pei_data.h>
 #include <broadwell/pei_wrapper.h>
+#include <broadwell/pm.h>
 #include <broadwell/romstage.h>
 #include <mainboard/google/samus/spd/spd.h>
 #include <mainboard/google/samus/gpio.h>
@@ -33,7 +34,10 @@ void mainboard_romstage_entry(struct romstage_params *rp)
 {
 	struct pei_data pei_data;
 
-	post_code(0x32);
+	post_code(0x31);
+
+	if (rp->power_state->prev_sleep_state != SLEEP_STATE_S3)
+		google_chromeec_kbbacklight(100);
 
 	printk(BIOS_INFO, "MLB: board version %d\n",
 	       google_chromeec_get_board_version());