Lenovo ThinkPad E475 User Manual

Also see for 20H4: Hardware Maintenance Manual

To enable or disable the Airplane mode, do the following:1. Open the Start menu.2. Click Settings ➙ Network & Internet ➙ Airplane mode.3. Slide the control for Airplane mode to turn it on or off.Using the NVIDIA Optimus Graphics featureSome ThinkPad notebook computers support NVIDIA Optimus Graphics.The running program and power plan settings that you use on your computer have specific graphics qualitydemand. To achieve the best balance between the computer performance and a long battery life, the NVIDIAOptimus Graphics feature automatically switches between High Performance Graphics and Energy SavingGraphics. You do not have to restart your computer, close programs, or intervene manually.Using audio featuresYour computer is equipped with the following items:• Audio connector, 3.5 mm (0.14 inches) in diameter• Microphones• SpeakersYour computer also has an audio chip that enables you to enjoy various multimedia audio features, such asthe following:• Compliant with High Definition Audio• Playback of MIDI and MP3 files• Recording and playback of PCM and WAV files• Recording from various sound sources, such as a headset attachedThe following list provides information about supported functions of the audio devices attached to theconnectors on your computer or the docking station.• Headset with a 3.5-mm (0.14-inch), 4-pole plug: Headphone and microphone functions• Conventional headphone: Headphone functionNote: The conventional microphone is not supported.Using the smart audio featureThe smart audio feature is supported on some computer models. To help protect against hearing loss, thefeature limits the computer’s maximum wide band true RMS output voltage to 130 mV when a headset orheadphone is connected.To change the setting, do the following:1. Go to Control Panel and view by Large icons.2. Click SmartAudio. In the window displayed, click the Disable Headphone Limiter icon. Then follow theon-screen instructions.26 E475 User Guide