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I tried Lion a few months ago, but had to revert to 10.6 because of the "coreaudiod bug" – where audio via QuickTime would stop working every few minutes, requiring a killall coreaudiod each time. Since I'm a video editor, this would interfere with Final Cut and After Effects, making Lion unusable.

Does anyone know if this issue has been fixed yet in Lion?

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I don't know if that specific issue has been fixed but there are a whole bunch of issues fixed with coreaudio in 10.7.4 -- I only know this because because I'm doing some beta testing of 10.7.4 and some pro-audio interface devices now specifically to see if <10.7.4 issues ae finally gone. If you have an Apple Developer ID you can download 10.7.4 and try it out, see if your issue is no longer present. –  Ian C. Mar 30 '12 at 3:10
    
Is there a reliable way to reproduce this? Is it specific to some particular hardware? –  Ken Oct 10 '12 at 18:49
    
This question is garnering lots of bad answers since the question doesn't refer to a specific bug ( has one even been filed ? ) or a sequence of steps to cause the issue. Please edit this and vote / flag for re opening if it can be objectively answered. –  bmike Nov 16 '12 at 15:40
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closed as not constructive by bmike Nov 16 '12 at 15:40

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3 Answers

Nope. Actually I have consistently had problems with coreaudiod spawning ports and generally causing the system to hang since 10.6.0

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Does the headphone connect via USB or line-out jack? If USB, it may be that the USB I/O driver for your headphone is causing the problem. Many I/O drivers for core audio (and all hardware devices) run within the kernel. A bug in the driver can cause problems with the driver manager code (coreaudiod, in this case) or even potentially the entire kernel.

Is it only with one specific headphone and/or one specific USB type output device? If its USB (and not line-out), try a different USB connector type (different brand) to see if the same problem arises. If its line-out, I have no idea what the problem might be.

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Nope it hasn't. I'm still having problems in Logic because of it. I plug in a headphone cable, unplug it, and suddenly the computer doesn't have sound. Try killall /usr/sbin/coreaudiod then relaunch it, I get this:

[...] Error: FIXME: IOUnserialize has detected a string that is not valid UTF-8, "?-8?????-8????PDa????@Da????0??????Ԕ?????<????????c".
Aug 14 01:56:48 Benjamins-MacBook-Pro.local coreaudiod[7392] Error: FIXME: IOUnserialize has detected a string that is not valid UTF-8, "?-8?????-8????PDa????@Da????0??????Ԕ?????????????c".
Aug 14 01:56:48 Benjamins-MacBook-Pro.local coreaudiod[7392] Error: FIXME: IOUnserialize has detected a string that is not valid UTF-8, "??c".
Aug 14 01:56:48 Benjamins-MacBook-Pro.local coreaudiod[7392] Error: FIXME: IOUnserialize has detected a string that is not valid UTF-8, "??c".
2012-08-14 01:56:48.994 coreaudiod[7392:707] Exiting due to uncaught exception in main

Apparently I've got some low level bug in my operating system or coreaudiod just wasn't compiled right.

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