MacOS 11.5 Update Causes Bootcamp Soundcard Driver to Fail

RESOLVED

After hours and hours of trying I solved it, I personally carried out these operations:

- Total backup with Acronis (Windows side)

- Total backup with TimeMachine (Mac side)

- BootCamp partition cloning with Winclone (Mac side)

Deleted BootCamp partition via wizard, re-created (blank) partition and verified audio was working again.

At that point I went to check which were the default audio drivers and for mine:

(MBP 15 "with TouchBar mid-2017 Model A1707) are i

Cirrus Logic CS840999 (AB 57)

After I went back to the mac partition and through Winclone I restored the image created previously so I did not lose any data and found myself the same windows installation without having to reinstall everything.

So in the end I can tell you that for MBP mid-2017 Model A1707 the correct drivers are Cirrus Logic CS840999 (AB 57)

Available in NON COMPATIBLE drivers.

I hope I have helped you.

Pic. 1

Pic. 2

Your CS8409 and CDB8409 seem to be the Analog and Digital versions of the same device. When you boot first in macOS, the EFI layer exposes the correct device. It fails on subsequent boots. As a test, run a SMC and NVRAM Reset and check if rebooting Windows, without switching to macOS, gives you back the correct device.

In About the security content of macOS Big Sur 11.5 - Apple Support, there are several updates related to Audio. Have you checked for any corresponding updates in Apple Software Updates (How to use Apple Software Update for Windows - Apple Support)?

What is the firmware version and year/model of your Mac? Do not post the serial number of your Mac.

The first screenshot is when imac has no sound ( CIRRUS LOGIC CDB8409 ) and the second one is when i boot to windows after booting first to macos ( CIRRUS LOGIC CS8409 (AB16) ) and having sound.

As i mentioned, this way of booting first macos and then windows is the only way to have sound working...

Can you check Windows Device Manager for any entries under Audio?

What is the year/model of your Mac (do not post the serial number)?

Were the drivers provided by Bootcamp Assistant during the installation of Windows?

Can you post a screen shot of Windows Device Manager, similar to Matteo_93m’s post?

Hi, same problem here on two imac 27 2017 model and macbook pro 13 inch 2017 model.

Have you solved this problem? I found a way to minimize this impact but it's not pratical at all.

If you boot your mac os device in mac mode, log in and then start in windows mode, sound issues are gone. But you need to do this every time you boot you mac device.

Please can anyone help to solve this issue!!!

Thanks, Afonso

MACOS 11.6

fredafonso wrote:

MACOS 11.6

This indicates an EFI bug in macOS Big Sur. Is it possible to test this on macOS Catalina?

Take a look at

• https://eclecticlight.co/2021/07/21/what-has-changed-in-macos-11-5/
• https://eclecticlight.co/2020/11/16/which-firmware-should-your-mac-be-using-version-5/

Your Mac should have new EFI. Please check.

As sugested, i tested SMC Reset before booting into windows and the sound was working ( CIRRUS LOGIC CS8409 (AB16) ) but when i restarted windows it became with no sound again ( CIRRUS LOGIC CDB8409 ).

What is the current macOS version?

Hi,

i have the same problem, after update my mac work normally, instead the windows part affected the issue of no sound!

I really need this partition and i cant create new one. I also try to call apple, but the operator tell me he cant help me, because this problem is on windows..(the problem appear after update from Apple) if anyone has a solution please share it!

Hello Loner T,

SMC reset didn't solve the issue but NVRAM reset did solve it while doing several subsequent boots in windows. But the issue comes back since the first boot in macos. This is an annoying issue because i need to work in both operating systems...

The NVRAM reset only solves the sound issue if there's no more booting in macos!

Do you have another suggestion that can solve this issue?

Thank You