PowerManagerService: enable logging for when mPowerState changes.

Change-Id: Idcd983106d66629070eda15e1160f708c789ab05
Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/services/java/com/android/server/PowerManagerService.java b/services/java/com/android/server/PowerManagerService.java
index fd518c3c..3a7a9d2 100644
--- a/services/java/com/android/server/PowerManagerService.java
+++ b/services/java/com/android/server/PowerManagerService.java
@@ -1364,7 +1364,7 @@
             boolean oldScreenOn = (mPowerState & SCREEN_ON_BIT) != 0;
             boolean newScreenOn = (newState & SCREEN_ON_BIT) != 0;
 
-            if (mSpew) {
+            if (mPowerState != newState) {
                 Log.d(TAG, "setPowerState: mPowerState=" + mPowerState
                         + " newState=" + newState + " noChangeLights=" + noChangeLights);
                 Log.d(TAG, "  oldKeyboardBright=" + ((mPowerState & KEYBOARD_BRIGHT_BIT) != 0)