Realtek High Definition Audio Driver for Apple - DriverIdentifier
The most common search leading to the keyword "MacBook Pro 9.2 Audio Driver" comes from Windows users. When you install Windows via Boot Camp on this model, the audio often works initially, but after a Windows Update or a Power Failure, the sound vanishes. Macbook Pro 9.2 Audio Driver
The most common fix for a glitched audio driver on macOS is restarting the Core Audio daemon. Realtek High Definition Audio Driver for Apple -
You must force the correct "model" for the HDA driver. This is done by editing /etc/modprobe.d/alsa-base.conf or creating a new file. the audio often works initially