102     mMutex.lock ();  in initialize()
125     mMutex.unlock ();  in initialize()
141     mMutex.lock ();  in getLevel()
143     mMutex.unlock ();  in getLevel()
163     mMutex.lock ();  in setLevel()
181         mMutex.unlock ();  in setLevel()
188         mMutex.lock ();  in setLevel()
217     mMutex.unlock ();  in setLevel()
227     mMutex.lock ();  in setScreenOffPowerState()
229     mMutex.unlock ();  in setScreenOffPowerState()
248     mMutex.lock ();  in setModeOff()
252     mMutex.unlock ();  in setModeOff()
270     mMutex.lock ();  in setModeOn()
274     mMutex.unlock ();  in setModeOn()