Update to 10.6.8 broke my optical audio - any help?

I have discussed this with Apple support. It appears that when there is more than one (i.e more than the internal I/O sound card) device then if the correct drivers are not installed Lion get confused and stops all sound out. I checked with Saffire for my interface and they have not yet released a working driver for Lion. I am having to revert to the previous OS.

@RoyH

Thanks so much for your update!

For me, my MBP seems useless now because I can not enjoy the movies with 5.1 sound.

I will wait for Apple releaing new update for it!

It seems Apple want to push something to run without carefully checking it!

I totally agree with you @Arto65,i got the same problem as yours. In my opinion, the Sebabo's fix works but for2009 mac minis, and does not work for 2010 mac minis. Could anyone with 2010mac mini confirm this?

Thank you all.

Hi, I used Sebabo's fix on a MACmini4.1 (2010 model) and the problem is solved. Sound is working just fine under snow leopard. I haven't upgraded to Lion yet, because I'm not sure if sebabo's fix works in Lion.

is this possible for Lion?

@TheSmokeMonster:

From my point of view: Yes!

Because just only upgrading, I faced the problem on the same file, same software!

I was refering to the fix.

It may be so. The fix works on my mid-2007 2 GHz Mini. I'll try it on Lion soon.

very cool, I'm still a little fuzzy about the the extensions since they seem to refer to the OS number.

I've also had this issue for the last few weeks, but only recently stumbled across this thread.

Having read through all 15 pages, I'm left with two thoughts:

- Lots of people have solved this by reformatting and reinstalling a pre-10.6.8 version. Seriously? Do Apple really expect people to reformat their machines to solve what should be a quick and easy fix to release?

- Thanks to those who've posted workarounds, but those aren't exactly practical. Download a 1.2GB update to extract one small kext from it? Maybe that's fine if you live in a town/city, but out here in rural England, high-speed broadband is still a pipe dream.

With that in mind, does anyone know anywhere the kext is available to download separately? Downloading 1.2GB would take me about a week on this connection...

I have a 2009 Mac Mini. Tried to replace the AppleHDA.kext bundle with the 10.6.7 version, but it did not work : I lost all optical sound, stereo as well as 5.1.

Had to reinstall 10.6.7.

Those who had success with sebabo workaround may have difficulties applying it identically on Lion since Pacifist 2.6.4 is not yet Lion compatible. Compatible version coming "end of summer".

Obviously there are other ways than Pacifist to downgrade the AppleHDA.kext extension, but not as many have proved successful.

Well.... I tried sebabo's trick on Lion using current version of pacifist and 10.6.7 extension successfully installed but audio is still not working 😟

According to http://www.charlessoft.com/, Pacifist 2.6.4 is not compatible with Lion.

I tried to install AppleHDA.kext 1.9.9f12 using it, following sabado instructions, but it did not work.

What DID work for me :

1) make a copy of /System/Library/Extensions/AppleHDA.kext from a working 10.6.7 system.

Get info for this copy should show :

1.9.9f12, Copyright Apple Inc. 2005-2010

Saturday August 1 2009 07:55

12 309 525 bytes <- ++NOT++ 8 455 397 bytes as a raw Pacifist extract

2) install Lion

3) use Kext Helper b7 to easy install the copy of AppleHDA.kext 1.9.9f12 (will replace the Lion original at /System/Library/Extensions/)

4) in Terminal, type "sudo touch /System/Library/Extensions"

Surprisingly, this worked for me 🙂 🙂

Hi geejii!

Could you please upload the file that work for you for me?

I do not have any 10.6.7 working AplleHDA.kext

Thank you very much in advance!