decrease the light-sensor rate to 1Hz (from ~15Hz) for ALS purposes.

    private static final int LONG_KEYLIGHT_DELAY = 6000;        // t+6 sec

    private static final int LONG_DIM_TIME = 7000;              // t+N-5 sec

    // How long to wait to debounce light sensor changes.

    // How long to wait to debounce light sensor changes in milliseconds

    private static final int LIGHT_SENSOR_DELAY = 2000;

    // For debouncing the proximity sensor.

    // light sensor events rate in microseconds

    private static final int LIGHT_SENSOR_RATE = 1000000;

    // For debouncing the proximity sensor in milliseconds

    private static final int PROXIMITY_SENSOR_DELAY = 1000;

    // trigger proximity if distance is less than 5 cm

            try {

                if (enable) {

                    mSensorManager.registerListener(mLightListener, mLightSensor,

                            SensorManager.SENSOR_DELAY_NORMAL);

                            LIGHT_SENSOR_RATE);

                } else {

                    mSensorManager.unregisterListener(mLightListener);

                    mHandler.removeCallbacks(mAutoBrightnessTask);