diff --git a/src/mainboard/starlabs/starbook/variants/mtl/devicetree.cb b/src/mainboard/starlabs/starbook/variants/mtl/devicetree.cb
index b86e01bc15..11b969fd26 100644
--- a/src/mainboard/starlabs/starbook/variants/mtl/devicetree.cb
+++ b/src/mainboard/starlabs/starbook/variants/mtl/devicetree.cb
@@ -18,6 +18,12 @@ chip soc/intel/meteorlake
 		[PchSerialIoIndexUART0]			= PchSerialIoSkipInit,
 	}"
 
+	# Power
+	register "pch_slp_s3_min_assertion_width"	= "SLP_S3_ASSERTION_1_MS"
+	register "pch_slp_s4_min_assertion_width"	= "SLP_S4_ASSERTION_3S"
+	register "pch_slp_sus_min_assertion_width"	= "SLP_SUS_ASSERTION_1_S"
+	register "pch_slp_a_min_assertion_width"	= "SLP_A_ASSERTION_98_MS"
+
 	# Device Tree
 	device domain 0 on
 		device ref igpu		on