diff --git a/src/mainboard/google/panther/devicetree.cb b/src/mainboard/google/panther/devicetree.cb
index 95f108402b..39d4f0677d 100644
--- a/src/mainboard/google/panther/devicetree.cb
+++ b/src/mainboard/google/panther/devicetree.cb
@@ -46,11 +46,9 @@ chip northbridge/intel/haswell
 			# SuperIO range is 0x700-0x73f
 			register "gen2_dec" = "0x003c0701"
 
-			# EC_SMI is GPIO34
-			register "alt_gp_smi_en" = "0x0004"
+			register "alt_gp_smi_en" = "0x0000"
 			register "gpe0_en_1" = "0x00000000"
-			# EC_SCI is GPIO36
-			register "gpe0_en_2" = "0x00000010"
+			register "gpe0_en_2" = "0x00000000"
 			register "gpe0_en_3" = "0x00000000"
 			register "gpe0_en_4" = "0x00000000"
 
@@ -73,9 +71,9 @@ chip northbridge/intel/haswell
 
 			device pci 13.0 off end # Smart Sound Audio DSP
 			device pci 14.0 on end # USB3 XHCI
-			device pci 15.0 on end # Serial I/O DMA
-			device pci 15.1 on end # I2C0
-			device pci 15.2 on end # I2C1
+			device pci 15.0 off end # Serial I/O DMA
+			device pci 15.1 off end # I2C0
+			device pci 15.2 off end # I2C1
 			device pci 15.3 off end # GSPI0
 			device pci 15.4 off end # GSPI1
 			device pci 15.5 off end # UART0