[LG Optimus 4X HD] LGaljo:
10-29 21:47:00.396 E/SensorService( 530): Error activating sensor 0 (Invalid argument)
10-29 21:47:00.406 V/Sensors ( 530): int poll__activate(sensors_poll_device_t*, int, int)
10-29 21:47:00.406 V/Sensors ( 530): int sensors_poll_context_t::activate(int, int)
10-29 21:47:00.406 D/Sensors ( 530): Sensor_enable:1 1
10-29 21:47:00.406 E/Sensors ( 530): mInitSuccess=0
10-29 21:47:00.406 E/SensorService( 530): Error activating sensor 1 (Invalid argument)
10-29 21:47:00.406 V/Sensors ( 530): int poll__activate(sensors_poll_device_t*, int, int)
10-29 21:47:00.406 V/Sensors ( 530): int sensors_poll_context_t::activate(int, int)
10-29 21:47:00.406 D/Sensors ( 530): Sensor_enable:2 1
10-29 21:47:00.406 E/Sensors ( 530): mInitSuccess=0
10-29 21:47:00.406 E/SensorService( 530): Error activating sensor 2 (Invalid argument)
10-29 21:47:00.406 V/Sensors ( 530): int poll__activate(sensors_poll_device_t*, int, int)
10-29 21:47:00.406 V/Sensors ( 530): int sensors_poll_context_t::activate(int, int)
10-29 21:47:00.406 D/Sensors ( 530): Sensor_enable:3 1
10-29 21:47:00.406 E/Sensors ( 530): mInitSuccess=0
10-29 21:47:00.406 E/SensorService( 530): Error activating sensor 3 (Invalid argument)
10-29 21:47:00.416 V/Sensors ( 530): int poll__activate(sensors_poll_device_t*, int, int)
10-29 21:47:00.416 V/Sensors ( 530): int sensors_poll_context_t::activate(int, int)
10-29 21:47:00.416 D/Sensors ( 530): Sensor_enable:4 1
10-29 21:47:00.416 E/Sensors ( 530): mInitSuccess=0
10-29 21:47:00.416 E/SensorService( 530): Error activating sensor 4 (Invalid argument)
10-29 21:47:00.416 V/Sensors ( 530): int poll__activate(sensors_poll_device_t*, int, int)
10-29 21:47:00.416 V/Sensors ( 530): int sensors_poll_context_t::activate(int, int)
10-29 21:47:00.416 D/Sensors ( 530): Sensor_enable:5 1
10-29 21:47:00.416 E/Sensors ( 530): mInitSuccess=0
10-29 21:47:00.416 E/SensorService( 530): Error activating sensor 5 (Invalid argument)
10-29 21:47:00.416 V/Sensors ( 530): int poll__activate(sensors_poll_device_t*, int, int)
10-29 21:47:00.416 V/Sensors ( 530): int sensors_poll_context_t::activate(int, int)
10-29 21:47:00.416 D/Sensors ( 530): Sensor_enable:6 1
10-29 21:47:00.416 E/Sensors ( 530): mInitSuccess=0
10-29 21:47:00.416 E/SensorService( 530): Error activating sensor 6 (Invalid argument)
10-29 21:47:00.416 V/Sensors ( 530): int poll__activate(sensors_poll_device_t*, int, int)
10-29 21:47:00.416 V/Sensors ( 530): int sensors_poll_context_t::activate(int, int)
10-29 21:47:00.416 D/Sensors ( 530): Sensor_enable:7 1
10-29 21:47:00.416 E/Sensors ( 530): mInitSuccess=0
10-29 21:47:00.416 E/SensorService( 530): Error activating sensor 7 (Invalid argument)
10-29 21:47:00.416 V/Sensors ( 530): int poll__activate(sensors_poll_device_t*, int, int)
10-29 21:47:00.416 V/Sensors ( 530): int sensors_poll_context_t::activate(int, int)
10-29 21:47:00.416 D/Sensors ( 530): Sensor_enable:10 1
10-29 21:47:00.416 E/Sensors ( 530): mInitSuccess=0
10-29 21:47:00.416 E/SensorService( 530): Error activating sensor 10 (Invalid argument)
10-29 21:47:00.416 V/Sensors ( 530): int poll__setDelay(sensors_poll_device_t*, int, int64_t)
10-29 21:47:00.416 V/Sensors ( 530): int sensors_poll_context_t::setDelay(int, int64_t)
10-29 21:47:00.416 V/Sensors ( 530): int poll__setDelay(sensors_poll_device_t*, int, int64_t)
10-29 21:47:00.416 V/Sensors ( 530): int sensors_poll_context_t::setDelay(int, int64_t)
10-29 21:47:00.416 V/Sensors ( 530): int poll__activate(sensors_poll_device_t*, int, int)
10-29 21:47:00.416 V/Sensors ( 530): int sensors_poll_context_t::activate(int, int)
10-29 21:47:00.416 D/ProximitySensor( 530): ProximitySensor-enable EN(1), newState(1),mEnabled(0)
10-29 21:47:00.416 V/ProximitySensor( 530): [PROX]APDS PROX SET ENABLE: flags = 1
10-29 21:47:00.426 W/ProximitySensor( 530): ProximitySensor-[setInitialState], value(0.000000)
10-29 21:47:00.426 V/Sensors ( 530): int poll__setDelay(sensors_poll_device_t*, int, int64_t)
10-29 21:47:00.426 V/Sensors ( 530): int sensors_poll_context_t::setDelay(int, int64_t)
10-29 21:47:00.426 V/Sensors ( 530): int poll__setDelay(sensors_poll_device_t*, int, int64_t)
10-29 21:47:00.426 V/Sensors ( 530): int sensors_poll_context_t::setDelay(int, int64_t)
10-29 21:47:00.416 D/ProximitySensor( 530): ProximitySensor-enable EN(1), newState(1),mEnabled(0)
10-29 21:47:00.416 V/ProximitySensor( 530): [PROX]APDS PROX SET ENABLE: flags = 1
10-29 21:47:00.426 W/ProximitySensor( 530): ProximitySensor-[setInitialState], value(0.000000)
10-29 21:47:00.426 V/Sensors ( 530): int poll__setDelay(sensors_poll_device_t*, int, int64_t)
10-29 21:47:00.426 V/Sensors ( 530): int sensors_poll_context_t::setDelay(int, int64_t)
10-29 21:47:00.426 V/Sensors ( 530): int poll__setDelay(sensors_poll_device_t*, int, int64_t)
10-29 21:47:00.426 V/Sensors ( 530): int sensors_poll_context_t::setDelay(int, int64_t)
10-29 21:47:04.166 V/Sensors ( 530): int poll__setDelay(sensors_poll_device_t*, int, int64_t)
10-29 21:47:04.166 V/Sensors ( 530): int sensors_poll_context_t::setDelay(int, int64_t)
10-29 21:47:04.166 V/Sensors ( 530): int poll__activate(sensors_poll_device_t*, int, int)
10-29 21:47:04.166 V/Sensors ( 530): int sensors_poll_context_t::activate(int, int)
10-29 21:47:04.166 D/ProximitySensor( 530): ProximitySensor-enable EN(0), newState(0),mEnabled(1)
10-29 21:47:04.166 V/ProximitySensor( 530): [PROX]APDS PROX SET ENABLE: flags = 0
10-29 21:47:04.166 W/ProximitySensor( 530): ProximitySensor-[setInitialState], value(0.000000)

This is the thing you can read from logcat...