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Jan Nechyba Author

Level 1

5 points

Update to 10.6.8 broke my optical audio - any help?

Hi everyone,

i have just upgrade my system to 10.6.8 and everything work fine except my audio thru optical output. I have pluged Logitech Z-5500 Digital to my MacBook Pro's optical sound output and my problem now is that, when i play some HD movie vith DolbyDigital AC3 ore DTS, it plays fine but when i stop watching movie and close VLC, no other sounds play.. no itunes, no standard stereo movies ect.. it plays only AC3 od DTS sound track.. so when i want to listen some music, i must restart MBP and it plays again everything until i open again movie with 5.1 track....

any solution to fix it?

thanks in advance

Jan

MacBook Pro 15, Mac OS X (10.6.7), 4 GB RAM

Posted on Jun 24, 2011 2:42 PM

341 replies

Jun 25, 2011 7:08 AM in response to Jan Nechyba

Same here:

Mac Pro (Mid2010) -> ATI 5870 -> miniDisplay w/ Audio -> HDMI -> Denon AVR-1911

Until and including 10.6.7 everything worked perfectly, but now I experience audio dropouts every 3-5 seconds.

Interestingly, the indicators on the Denon AVR display for PCM/DIG/HDMI input signals blink, which I'd interpret as a loss- of- sync on the interface. Looks like a serious bug in the driver to me.

Jun 25, 2011 7:25 AM in response to Jan Nechyba

Same here with Mac mini (Mid 2010) and Pioneer VSX-1021K!

I'm using EyeTV and TV-Stations with Dolby Digital are working just fine, but TV-Stations with stereo have no Sound!

Going back to the appleHDA.ktext from 10.6.7 solved the Problem for me!

Thanks TimeMachine!!!

shorafix

Level 1

0 points

Jun 25, 2011 7:54 AM in response to Jan Nechyba

Same Problem here: MacPro 5.1 after updating to 10.6.8

I was listening to some music in iTunes. Next in line was a movie from iTunes. When I stopped playing the movie and clicked on the next song in iTunes, all of a sudden optical audio was gone. When switching to display audio sound plays back well. However, no way to switch back to optical audio. DVD Audio also does not playback on optical audio.

I have not yet reseted my MacPro in order to find out if this would temporarily fix the problem.

marc0904

Level 1

0 points

Jun 25, 2011 8:31 AM in response to yomamma_de

Restoring of AppleHDA.kext out of a 10.6.7 backup solved my problems too. Thank you, yomamma_de

Jun 25, 2011 9:55 AM in response to yomamma_de

thanks a lot, it's working again after AppleHDA.kext restore from time machine. I hope Apple will solve this issue in a correct way.

shorafix

Level 1

0 points

Jun 25, 2011 11:23 AM in response to Jan Nechyba

O.K. it seems to be obvious for everyone except me: what is appleHDA.ktext (or appleHDA.kext?) and where can I find it?

Jan Nechyba Author

Level 1

5 points

Jun 25, 2011 11:29 AM in response to shorafix

Hi shorafix, you can find appleHDA.kext in Macintosh HD/System/Library/Extensions/AppleHDA.kext

just select it, start timemachine a restore old kext from date when you have 10.6.7 installed..

Barney-15E

Level 10

116,710 points

Jun 25, 2011 11:35 AM in response to Jan Nechyba

Has anyone tried installing the updated combo?

I see at least one has, but it didn't help.

I've got no problem with digital audio on my Macbook Pro and I'm running Perian.

Jun 25, 2011 11:37 AM in response to yomamma_de

Hi!

I have exactly the same problem, and it makes me go crazy, because I want to watch TV normally!!

I am not really sure, if my last TM-Backup was with 10.6.7 or 10.6.6 - how can I find out?

Thanks in advance!

Stefan

Jan Nechyba Author

Level 1

5 points

Jun 25, 2011 11:42 AM in response to Barney-15E

Yes, i tried first instaling combo update... there is no problem with digital audio until you passthrough AC3 or DTS sound track directly to receiver.. since then stereo digital audio is dead..

Jan Nechyba Author

Level 1

5 points

Jun 25, 2011 11:47 AM in response to Stefan Sigmund

Hi Stefan, the AppleHDA should be the same in 10.6.6 and 10.6.7.. (it its version 1.9.9)... just locate in /System/Library/Extensions/AppleHDA.kext , start TimeMachine , select the previous backed up appleHDAkext file and pres CMD+I to know which version it is...

Jun 25, 2011 11:56 AM in response to Jan Nechyba

-> Jan Nechyba: Thank you. The version is "1.9.9f12", that says the Finder, as well as the plist in the package. Is this good? If so, then fine.

But I still would like to know, which system version the last backup was, where can I find this information?

Jan Nechyba Author

Level 1

5 points

Jun 25, 2011 12:10 PM in response to Stefan Sigmund

Yes, the 10.6.7 version of AppleHDA.kext is 1.9.9f12...

and which is yours latest system backup timemachine show i think only when you tried to restore OS X from TimeMachine backup.. otherwise you can go to System prefences -> Software update -> Instaled software and compare the date of installing 10.6.7 update with the date your latest TimeMachine backup...

Jun 25, 2011 12:20 PM in response to Jan Nechyba

Thank you very much! Now I know it was 10.6.7 … 😉 hope the kext will solve the problem!

Jun 25, 2011 12:44 PM in response to Stefan Sigmund

Ok, optical audio Output works fine again thanks to the old AppleHDA.kext from 10.6.7 (or 10.6.6) version 1.9.9f12!

Thanks to all! 🙂

Update to 10.6.8 broke my optical audio - any help?