93   mMutex.lock();  in initialize()
118   mMutex.unlock();  in initialize()
132   mMutex.lock();  in getLevel()
134   mMutex.unlock();  in getLevel()
152   mMutex.lock();  in setLevel()
168     mMutex.unlock();  in setLevel()
175     mMutex.lock();  in setLevel()
205   mMutex.unlock();  in setLevel()
214   mMutex.lock();  in setScreenOffPowerState()
216   mMutex.unlock();  in setScreenOffPowerState()
233   mMutex.lock();  in setModeOff()
239   mMutex.unlock();  in setModeOff()
255   mMutex.lock();  in setModeOn()
261   mMutex.unlock();  in setModeOn()