Previous 1 2 3 Next 341 Replies Latest reply: Oct 13, 2011 6:35 AM by ArnoutF
Jan Nechyba Level 1 (0 points)

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



MacBook Pro 15, Mac OS X (10.6.7), 4 GB RAM
  • aritza Level 1 (0 points)

    Same problem here imac 24, cant get optical output work after update.

  • PAPPL Level 1 (0 points)

    Same problem here Mac Mini 2009. No stereo out after surround sources over optical out to external receiver.

    Problem occurs right after update to OSX 10.6.8

    Tried to change settings in sound & midi menu but only rebbot enables stereo again.

    This problem is present in safari browser since i got my mac mini in 2009, after watching surround sources in itunes or vlc i have to restart safari to get stereo sound (e.g. youtube) again, but now stereo doesn't work anymore on whole OSX until reboot.

  • mweisser Level 1 (0 points)

    Same problem, too. i use a mac mini core solo. reinstalling 10.6 + combo update to 10.6.8 didn't work either. currently workin' a rollback to 10.6.7. let's hope for a quick fix.

  • Faro_1980 Level 1 (0 points)

    Same problem here... Using a Mac Pro, and also the Logitech Z-5500.

    I guess there is a bug in 10.6.8

    I hope they will fix it soon!!!

  • Joeyjojo25 Level 1 (60 points)

    Seeing as there is no way for me to contact suport as my hardware is out of warranty (MacMini-Late 2009), I thought I'd post in here that this is also happening to me. I use it to play music from iTunes and watch videos. Now that the stereo optical out is broken and I can't roll back the update, it's useless. As others have said, DTS and AC3 is fine, but not stereo. This is BS! How was this not found in testing??? I'll now have to plug in an analouge stereo lead and give up DTS & AC3 until this is sorted. Hopefully it's not long.


    I just got my MacBook bottom replaced last month and my iPhone 4 the month before. Apple used to be reliable. At least they're making billions in profit every year

  • Seanld Level 1 (0 points)

    I'm using a Macbook Pro 17" (2008) and when I did this latest update (the one with the MacDefender fix) it broke my sound.


    Digital sound works in VLC, but nothing else works. No sound in my browsers, no sound in Quicktime, no system sounds, nothing except VLC when I choose Audio Output-Built-In Output-(Encoded Output). *****.


    Apple, fix this now, please.

  • MakX Level 1 (5 points)

    I'm having audio issues but of a slightly different nature. Any audio output via HDMI to my Sony TV, ever since the 10.6.8 update, has been skipping every now and again. I have tried lowering sample rates and bit depth in Audio MIDI Setup app but it's really made no noticeable difference.


    It's definitely software related as it was working 100% fine before the update. Yep, Apple need to get this fixed ASAP - and the issues better not be replecated in Lion.

  • babouin72 Level 1 (0 points)

    Same problem :

    Mac Mini 2009. No stereo out after surround sources over optical out to external receiver.

    Problem occurs right after COMBO update to OSX 10.6.8

    tried to re-apply combo, not solving...

  • enjayjay Level 1 (0 points)

    Perian installed?


    10.6.8 installed - all OK - Eyetv sound. I watched an MKV - multi channel output. After this my eyetv which is stereo (encoded as dolby surround II) by perian stopped working - silence - though something was hitting my amp - it was getting some stream but silence. Audio midi setup would crash every time I would try and open it when eyetv TV window open. Removed perian - now I have sound back in eyetv.


    Perians fault? Apples fault?


    Not sure - but it got it back for me.

  • babouin72 Level 1 (0 points)



    Perian is not installed on my system...

  • Jan Nechyba Level 1 (0 points)

    hi enjayjay, removing Perian did NOT solve my problem... Stereo out is still broken after  AC3/DTS passthrough...only restart will helps... I have but found some users in macrumors forum, that revert back appleHDA.kext from 10.6.7 timemachine backup and it solves their problems with audio.. But my question is, if it "safe" to replace new kext with old one? if the system will be stable or should we wait for apple update or Lion (i hope there is not the same audio driver as in 10.6.8 )

  • nickmooney Level 1 (0 points)

    Audio problem here for 10.6.8 - I get NO SOUND whatsoever now (through internal speakers or through earphones).


  • PAPPL Level 1 (0 points)

    Even original iTunes-movies don't switch back to stereo output when selected in menu.


    Perian is not the problem! Removed perian and after new login same problem.


    It's enough to log off and relog into MacOSX to enable stereo out again, this is quicker than a reboot.



  • Jan Nechyba Level 1 (0 points)

    You're right...


    Apple really screwed up the sound, even when using their own application... i tried DVD, and it plays 2.0 AC3 and 5.1 AC3 fine.. but after stop playing DVD, stereo digital output is dead..

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