--- xnu/xnu-1504.9.26/iokit/Kernel/RootDomainUserClient.cpp
+++ xnu/xnu-1504.7.4/iokit/Kernel/RootDomainUserClient.cpp
@@ -194,23 +194,6 @@
 #endif
 }
 
-IOReturn RootDomainUserClient::secureSetUserAssertionLevels(
-    uint32_t assertBits )
-{
-    int                     admin_priv = 0;
-    IOReturn                ret = kIOReturnNotPrivileged;
-    
-    ret = clientHasPrivilege(fOwningTask, kIOClientPrivilegeAdministrator);
-    admin_priv = (kIOReturnSuccess == ret);
-
-    if (admin_priv && fOwner) {
-        ret = fOwner->setPMAssertionUserLevels(assertBits);
-    } else {
-        ret = kIOReturnNotPrivileged;
-    }
-    return kIOReturnSuccess;
-}
-
 IOReturn RootDomainUserClient::clientClose( void )
 {
     detach(fOwner);
@@ -255,10 +238,6 @@
         {   // kPMSetMaintenanceWakeCalendar, 8
             (IOService *)1, (IOMethod)&RootDomainUserClient::secureSetMaintenanceWakeCalendar,
             kIOUCStructIStructO, sizeof(IOPMCalendarStruct), sizeof(uint32_t)
-        },
-        {   // kPMSetUserAssertionLevels, 9
-            (IOService *)1, (IOMethod)&RootDomainUserClient::secureSetUserAssertionLevels,
-            kIOUCScalarIScalarO, 1, 0
         }
     };