diff --git a/src/northbridge/intel/i945/acpi/i945.asl b/src/northbridge/intel/i945/acpi/i945.asl
index 47a6931c67..6a34b94535 100644
--- a/src/northbridge/intel/i945/acpi/i945.asl
+++ b/src/northbridge/intel/i945/acpi/i945.asl
@@ -22,6 +22,25 @@
 #include "hostbridge.asl"
 #include "../i945.h"
 
+/* Operating System Capabilities Method */
+Method (_OSC, 4)
+{
+	// Create DWord-addressable fields from the Capabilities Buffer
+	CreateDWordField(Arg3, 0, CDW1)
+	CreateDWordField(Arg3, 4, CDW2)
+	CreateDWordField(Arg3, 8, CDW3)
+
+	/* Check for proper PCI/PCIe UUID */
+	If (LEqual(Arg0, ToUUID("33DB4D5B-1FF7-401C-9657-7441C03DD766")))
+	{
+		/* Let OS control everything */
+		Return(Arg3)
+	} Else {
+		Or(CDW1, 4, CDW1)	// Unrecognized UUID, so set bit 2 to 1
+		Return(Arg3)
+	}
+}
+
 /* PCI Device Resource Consumption */
 Device (PDRC)
 {