diff --git a/src/mainboard/system76/cml-u/devicetree.cb b/src/mainboard/system76/cml-u/devicetree.cb
index 04b88ff21f..52694c375c 100644
--- a/src/mainboard/system76/cml-u/devicetree.cb
+++ b/src/mainboard/system76/cml-u/devicetree.cb
@@ -127,8 +127,9 @@ chip soc/intel/cannonlake
 	register "PcieClkSrcClkReq[5]" = "5"
 
 	# Misc
-	register "Device4Enable" = "1"
-	register "HeciEnabled" = "1"
+	register "Device4Enable" = "0"
+	register "HeciEnabled" = "0"
+	register "Heci3Enabled" = "0"
 	register "AcousticNoiseMitigation" = "1"
 	#register "dmipwroptimize" = "1"
 	#register "satapwroptimize" = "1"
@@ -198,7 +199,7 @@ chip soc/intel/cannonlake
 		device pci 15.1 off end # I2C #1
 		device pci 15.2 off end # I2C #2
 		device pci 15.3 off end # I2C #3
-		device pci 16.0 on  end # Management Engine Interface 1
+		device pci 16.0 off end # Management Engine Interface 1
 		device pci 16.1 off end # Management Engine Interface 2
 		device pci 16.2 off end # Management Engine IDE-R
 		device pci 16.3 off end # Management Engine KT Redirection