The Conexant CX20671 SmartAudio HD driver allows Windows to communicate with the Conexant audio hardware built into your computer. Installing a compatible package helps restore sound playback, microphone input, and access to the audio controls supported by your system.

Key Features

• Audio playback and recording: Enables Windows and applications to use the device for speaker output, headphone listening, and microphone capture.
• Connection handling: Supports audio jack functions, such as switching between built-in speakers and connected headphones, where implemented by the computer manufacturer.
• SmartAudio controls: Compatible packages may include options for adjusting playback and recording settings. Available controls depend on the driver release and your computer’s hardware.
• System integration: Provides the hardware-specific support Windows needs to recognize and operate the audio device. Choosing the correct version can help resolve problems caused by a missing or incompatible driver.

How to Install

1. Confirm your computer and Windows version. Check your PC model and whether you use Windows 11, 10, 8, or 7. Also confirm the system architecture, such as 32-bit or 64-bit, so you can select a matching package.

1. Choose a compatible driver. Look for a Conexant CX20671 SmartAudio HD package intended for your computer model and operating system. Manufacturer-customized audio drivers are often preferable because they account for the laptop or desktop’s specific speakers, microphones, and jack layout. Do not assume one package supports every listed Windows version.

1. Prepare for installation. Close audio applications and save your work. If you are replacing a working driver to troubleshoot an issue, consider creating a Windows restore point before making changes.

1. Install the package. Extract the download if necessary, then run its setup program and follow the prompts. If the package contains only driver files, open Device Manager, locate the audio device, select Update driver, and browse to the extracted folder.

1. Restart and test the sound. Reboot if prompted, then check playback and microphone input in Windows sound settings. Select the correct output and input devices, and test headphones separately if you use them.

If installation fails or sound remains unavailable, verify the package’s hardware compatibility before trying another release. On Windows 11 especially, confirm that the computer manufacturer provides a suitable driver rather than relying on the device name alone.

Common Issues and Fixes

• Installer fails or rolls back: Uninstall existing Conexant SmartAudio/HD Audio entries in Device Manager under Sound, video and game controllers, reboot, then run the CX20671 package as administrator. Use the OEM driver matched to your laptop model and Windows build.
• Device not detected/no audio: Enable onboard audio in BIOS/UEFI and scan for hardware changes in Device Manager. If Windows shows only “High Definition Audio Device,” install the OEM Conexant package plus chipset/BIOS updates.
• Version conflicts or Windows replaces the driver: Roll back to the OEM Conexant driver, temporarily pause automatic driver updates, and avoid overlapping Realtek/Conexant audio packages. Reboot after each change.