diff --git a/services/core/java/com/android/server/input/InputManagerService.java b/services/core/java/com/android/server/input/InputManagerService.java
index 75b9705e104..722a10ee1ce 100644
--- a/services/core/java/com/android/server/input/InputManagerService.java
+++ b/services/core/java/com/android/server/input/InputManagerService.java
@@ -1836,6 +1836,7 @@ public class InputManagerService extends IInputManager.Stub
 
     // Native callback.
     private long interceptKeyBeforeDispatching(IBinder focus, KeyEvent event, int policyFlags) {
+        Slog.w(TAG, "===> traceKey A3, keycode="+event.getKeyCode()+" in interceptKeyBeforeDispatching of InputManagerService.java");
         return mWindowManagerCallbacks.interceptKeyBeforeDispatching(focus, event, policyFlags);
     }
 
diff --git a/services/core/java/com/android/server/policy/PhoneWindowManager.java b/services/core/java/com/android/server/policy/PhoneWindowManager.java
index c01ab4227d2..a72c6a0f7ee 100644
--- a/services/core/java/com/android/server/policy/PhoneWindowManager.java
+++ b/services/core/java/com/android/server/policy/PhoneWindowManager.java
@@ -3173,6 +3173,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {
 	
     @Override
     public long interceptKeyBeforeDispatching(WindowState win, KeyEvent event, int policyFlags) {
+	Log.d(TAG, "====> traceKey A1, keycode="+event.getKeyCode()+" in interceptKeyBeforeDispatching of PhoneWindowManager.java");
         final long result = interceptKeyBeforeDispatchingInner(win, event, policyFlags);
         final int eventDisplayId = event.getDisplayId();
         if (result == 0 && !mPerDisplayFocusEnabled
@@ -3214,6 +3215,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {
         final int displayId = event.getDisplayId();
 		
 
+	Log.d(TAG, "====> traceKey A0, keycode="+keyCode+" in interceptKeyBeforeDispatchingInner of PhoneWindowManager.java");
 
         if (DEBUG_INPUT) {
             Log.i(TAG, "interceptKeyTi keyCode=" + keyCode + " down=" + down + " repeatCount="
@@ -3895,6 +3897,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {
         int actions = interceptKeyBeforeQueueing(fallbackEvent, policyFlags);
 			
         if ((actions & ACTION_PASS_TO_USER) != 0) {
+
             long delayMillis = interceptKeyBeforeDispatching(
                     win, fallbackEvent, policyFlags);
             if (delayMillis == 0) {
@@ -4375,6 +4378,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {
                                                 isKeyguardShowingAndNotOccluded() :
                                                 mKeyguardDelegate.isShowing()));
 
+	Log.d(TAG, "====> traceKey B0, keycode="+keyCode+" in interceptKeyBeforeQueueing of PhoneWindowManager.java");
         if (DEBUG_INPUT) {
             Log.d(TAG, "interceptKeyTq keycode=" + keyCode
                     + " interactive=" + interactive + " keyguardActive=" + keyguardActive
diff --git a/services/core/java/com/android/server/wm/InputManagerCallback.java b/services/core/java/com/android/server/wm/InputManagerCallback.java
index 6b500967f42..ecdf90f0fbe 100644
--- a/services/core/java/com/android/server/wm/InputManagerCallback.java
+++ b/services/core/java/com/android/server/wm/InputManagerCallback.java
@@ -180,6 +180,7 @@ final class InputManagerCallback implements InputManagerService.WindowManagerCal
     public long interceptKeyBeforeDispatching(
             IBinder focus, KeyEvent event, int policyFlags) {
         WindowState windowState = mService.windowForClientLocked(null, focus, false);
+        Slog.i(TAG_WM, "===> traceKey A2, keycode="+event.getKeyCode()+" in interceptKeyBeforeDispatching of InputManagerCallback.java");
         return mService.mPolicy.interceptKeyBeforeDispatching(windowState, event, policyFlags);
     }
 
diff --git a/services/core/jni/com_android_server_input_InputManagerService.cpp b/services/core/jni/com_android_server_input_InputManagerService.cpp
index fb3076ba9dd..ab66f40b205 100644
--- a/services/core/jni/com_android_server_input_InputManagerService.cpp
+++ b/services/core/jni/com_android_server_input_InputManagerService.cpp
@@ -1148,6 +1148,7 @@ nsecs_t NativeInputManager::interceptKeyBeforeDispatching(
 
         jobject keyEventObj = android_view_KeyEvent_fromNative(env, keyEvent);
         if (keyEventObj) {
+            ALOGI("===> traceKey A4, keyCode=%d in %s of %s line %d", keyEvent->getKeyCode(), __func__, __FILE__,__LINE__);
             jlong delayMillis = env->CallLongMethod(mServiceObj,
                     gServiceClassInfo.interceptKeyBeforeDispatching,
                     tokenObj, keyEventObj, policyFlags);