--- xnu/xnu-517.7.21/iokit/Kernel/IOPMrootDomain.cpp
+++ xnu/xnu-517.9.4/iokit/Kernel/IOPMrootDomain.cpp
@@ -771,6 +771,13 @@
     return kIOReturnSuccess;
 }
 
+IOReturn IOPMrootDomain::registerPlatformPowerProfiles
+        (OSArray        *system_profiles)
+{
+    if(!system_profiles) return kIOReturnBadArgument;
+    if(getProperty("SystemPowerProfiles")) return kIOReturnExclusiveAccess;
+    setProperty("SystemPowerProfiles", system_profiles);
+}
 
 //*********************************************************************************
 // receivePowerNotification