The Conexant CX20671 SmartAudio HD driver allows Windows to communicate with your computer’s built-in Conexant audio hardware. Installing a compatible package can help restore missing sound, enable microphone input, and resolve audio problems caused by an absent or incorrect driver.

Key Features

• Audio playback and recording: Provides driver support for speaker and headphone output, along with microphone input on compatible systems.
• Hardware-specific audio controls: Enables the audio settings supported by your computer’s implementation of the CX20671 codec. Some manufacturer packages may also include SmartAudio controls.
• Audio connection handling: Supports available audio ports and jack detection where these functions are implemented by the computer manufacturer.
• Windows compatibility: Driver packages may be available for Windows 11, 10, 8, and 7. Compatibility depends on the specific package, your computer model, and whether Windows uses a 32-bit or 64-bit architecture.

How to Install

1. Confirm your hardware and Windows version. Open Device Manager and check under “Sound, video and game controllers” for Conexant CX20671 SmartAudio HD. If it appears as an unknown device, use its hardware IDs to help verify the match. Check your Windows version and system type in system settings.

1. Choose a compatible driver package. Match the download to your computer model, operating system, and architecture. Prefer a package supplied or approved by your computer manufacturer, since built-in audio can depend on model-specific configuration. Do not assume a Windows 7 or Windows 8 package will work correctly on Windows 10 or Windows 11.

1. Prepare for installation. Save your work and close applications that use audio. If you are replacing an existing driver to troubleshoot a problem, create a restore point first so you have a recovery option.

1. Install the driver. Extract the downloaded archive if necessary, then run the included installer and follow its prompts. If the package has no installer, open Device Manager, right-click the audio device, select “Update driver,” and browse to the extracted driver folder.

1. Restart and test your audio. After installation, restart the computer and check speaker, headphone, and microphone operation. If sound is still missing, confirm that the correct playback and recording devices are selected in Windows sound settings before trying another driver.

Common Issues and Fixes

• Installer fails or rolls back: The CX20671 package may reject newer Windows builds or conflict with an existing SmartAudio install. Run as administrator, try Windows compatibility mode, uninstall the current Conexant/SmartAudio driver in Device Manager (delete driver software), reboot, then install the OEM package for your exact laptop model.
• Device not detected/no audio: Confirm onboard audio is enabled in BIOS/UEFI and not disabled by a headset switch. In Device Manager, scan for hardware changes and check hidden devices; if only "High Definition Audio Device" appears, install the CX20671 driver, then reboot.
• Version conflicts after Windows Update: Windows may replace the Conexant driver with a generic HD Audio driver. Remove duplicate Conexant/SmartAudio entries, block automatic driver updates temporarily, and reinstall the OEM CX20671 driver.