Using a third party Realtek Audio Driver may also work but you will not get the Dolby Audio Enhancement. Remove the Windows 10 Update that was installed then repeat Step 1 Remove the Dolby Home Theater v4 audio enhancement from the Program list (press Windows Key+R > appwiz.cpl), reboot, then re-install it from the folders c:\drivers\Realtek Audio Driver\PCEE4 and c:\drivers\Realtek Audio Driver\DS1\圆4 The only way to remove & correct the Dolby Audio Enhancement is to either:
During installation process, choose either 'DAA (release)' for Advanced Audio v2 OR 'DHT (release)' for Home Theater v4. NOTE: For Win 8/8.1, Disable Driver Signature Enforcement. If you have upgraded to Windows 10 from the preloaded Win 8.1 OS, the Dolby Audio driver will be carried over but it may break (or over written if a new audio driver is installed) as this wasn't a tested OS as per, , & Uninstall Realtek HD Audio drivers or NVIDIA or ATI HD Audio drivers. In addition to what have been suggested, when you install the Realtek Audio Driver from the Lenovo website, it also installs the Dolby Home Theater v4 audio enhancement (which is bundled with the audio driver).
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