This model typically uses the audio codec. Without the specific driver for this chip, Windows defaults to a generic "High Definition Audio" driver, which can result in:
| 文件名 | 作用 | |--------|------| | CS420x64.cat | 安全目录文件，包含Microsoft数字签名 | | CirrusAPO_x64.dll | 音频处理对象（APO）动态链接库 | | cs420x_45.inf | 设备安装信息文件，声明声卡兼容性 | | cs420x_45.PNF | INF文件的预编译版本 | | CS420x64.sys | 声卡功能驱动程序 |
So, you’ve decided to dual-boot your trusty MacBook Pro A1278 with Windows 10. The installation goes smoothly, the keyboard lights up, and you’re ready to go—until you try to play some music or join a Zoom call, and you realize the audio is either missing entirely, crackling, or sounding flat and tinny. apple macbook pro a1278 audio driver windows 10 high quality
2013年之前生产的MacBook（包括A1278）在UEFI模式下安装Windows 10时，UEFI固件默认不会将Cirrus Logic CS4206B音频控制器暴露给Windows操作系统。这意味着无论你安装什么驱动程序，Windows都无法“看到”声卡硬件。
Installing the official Cirrus Logic driver using the compatibility mode steps above updates the switching logic and turns off the optical transmitter when headphones are unplugged. Issue 2: No Sound After Windows 10 Updates This model typically uses the audio codec
The following guide outlines how to restore high-quality audio by addressing the root cause: the BIOS vs. UEFI installation conflict. 1. The Critical Fix: Legacy BIOS vs. UEFI
When Windows 10 fails to detect the Cirrus Logic audio hardware, or uses generic drivers, you are left with no sound, or worse, "low-quality" audio with crackling. or uses generic drivers
Once Windows is correctly installed in Legacy mode, you need specific Apple-certified drivers.
You need the last stable driver packages released for these legacy machines.