iMac 2011: opencore + Catalina = NoSound

[webdepp]

Hey guys
Thanks to this forum, my iMac (12.2) runs now smooth as silk. I installed a different GPU (780M), got the bootscreen working (thanks to Nick[D]vB) and managed to install the DyingLight module.
But still I needed dosdudes1 patch to install Catalina or Mojave.
Since I successfully used opencore on my MacPro5.1 (https://forums.macrumors.com/threads/opencore-on-the-mac-pro.2207814/?post=27914713#post-27914713) to install and upgrade Catalina natively, I was wondering if it can be used on the iMac too.
So started the Internet Recovery, wiped disks (dd if=/dev/zero of=...) and did a fresh clean HighSierra install. Then I installed OC and everything worked fine. I was able to download Catalina from the AppStore and launched the install. This also worked like a charm.
But after the setup was completed, I realized that there is no more sound. I can hear the startup chime, but Catalina tells me, that there is no audio input/ouput device. Bu it was working in HighSierra though ...
Any one experienced sound issues in Catalina? Is there a way to install drivers from HighSierra?
Currently I'm doing another clean HS install and try a Mojave upgrade, to see if the sound works.

 

[webdepp]

Just a quick update ... Same thing on Mojave. No audio device was found.
Does anybody know, what files dosdudes little programm patches?

 

[FlorisVN]

Just a quick update ... Same thing on Mojave. No audio device was found.
Does anybody know, what files dosdudes little programm patches?

As fsr as I know, dosdude1's patcher put's back legacy audio kexts for your type of iMac..

 

[webdepp]

Thank you. I'll give it a try

 

[nathan991]

Any update here? I'd like to do the same and was wondering if it worked.

Thanks!

 

[FlorisVN]

btw, catalina patcher is open source I guess.
perhaps you can use some of this info here.. ?

you can check the source code anyway..

GitHub - dosdude1/macos-catalina-patcher: macOS Catalina Patcher (http://dosdude1.com/catalina)

macOS Catalina Patcher (http://dosdude1.com/catalina) - dosdude1/macos-catalina-patcher

github.com

 

[M K]

I have the same issue – imac 11,2, mojave installed with dosdude's patch + replaced GPU (k2100m) and opencore loader from Nick[D]vB - bootscreen and backlight work, but no sound. Tried to re-apply post install patch and rebuild kext cache but no effect.
Did you figure out how to fix this?

Any one experienced sound issues in Catalina?

 

[JoeOIVOV]

I too am also having this same issue once I installed Open Core 5.7, no sound. 12,2 - High Sierra

I'm going to try uninstalling it right now.
[automerge]1586191376[/automerge]

I too am also having this same issue once I installed Open Core 5.7, no sound. 12,2 - High Sierra

I'm going to try uninstalling it right now.

Wow, uninstalling OC by deleting the folder and doing PRAM reset didnt fix the no sound issue. When I try adjusting the volume it shows a no smoking sign.

 

[JoeOIVOV]

I too am also having this same issue once I installed Open Core 5.7, no sound. 12,2 - High Sierra

I'm going to try uninstalling it right now.
[automerge]1586191376[/automerge]


Wow, uninstalling OC by deleting the folder and doing PRAM reset didnt fix the no sound issue. When I try adjusting the volume it shows a no smoking sign.

Restoring from Time Machine to before the time I installed OC fixed the issue.

 

[TAPKAE]

For those of you who have this dead sound output issue, is that something that is only happening as a System audio phenomenon or have any of you been using external sound devices? I'm pretty invested in a few Focusrite Saffire Pros.