Windows Update frequently overwrites the Cirrus driver with a generic Intel one.
Older MacBook Pro models (pre-2013) use a hybrid firmware that requires Windows to be installed in Legacy/BIOS mode to activate the audio interface. Apple Macbook Pro A1278 Audio Driver Windows 10
Reviewing the audio driver experience for an Apple MacBook Pro A1278 (Mid-2009 to Mid-2012 models) running Windows 10 reveals a landscape defined by significant installation hurdles but solid performance once the correct legacy configuration is achieved. The "Legacy" Barrier The most critical takeaway for A1278 users is that Windows 10 must be installed via Legacy BIOS/MBR mode for the audio hardware to be recognized. The UEFI Problem Windows Update frequently overwrites the Cirrus driver with
A red light glowing from inside the headphone jack and no sound from the speakers. Apple Macbook Pro A1278 Audio Driver Windows 10