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Sound stuttering after Mountain Lion install

Dear community,


after having installed OSX Mountain Lion my sound startet stuttering whenever there is rapid movement on my screen.

This includes e.g. window movement, scrolling through image loaded websites or video playback (flash player, quicktime).

A restart didn't help. I'm using stereo output, not digital.


I have connected a second monitor but the problem persists after disconnecting it. Movement on the second monitor also causes the sound to stutter.

My GPU Diode temperature is at 85°C (there is some bug that keeps the GPU under load while a second monitor is connected AFAIK), but I guess it was the same under Snow Leopard.


In Snow Leopard the sound output was always perfect even under heavy load or heavy HDD I/O.


Any ideas?

iMac (27-inch Mid 2011), OS X Mountain Lion

Posted on Jul 28, 2012 5:48 AM

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Posted on Jul 28, 2012 3:22 PM

I am also having this issue as well.


I opened Activity Monitor and noticed that during the stuttering, coreaudiod jumps in CPU usage, often past 5%. I have also noticed graphics lag when this occurs if I'm doing something like watching full-screen video or gaming.


I'm currently experiencing this on mid 2011 iMac 27" as well as a 24" iMac 2009 model I use at work.

1,223 replies

Aug 12, 2012 12:57 PM in response to davidvoy

It happened to me. I had an Apple Computer and the logic board went bad. Heat and dust are the destroyers of all computers or anything electronic. When the computer gets two hot, there is a safety that shuts it off. Either it needs to be vacumed, or the fan is not working, or it could be more serious, ie the logic board or something else. Sometimes.... think of a garden hose... Only so much water could pass through a garden hose at any given time. But then you upgrade the outdoor pipes out side and now you have the ability to have more pressure in the outside pipes (so you can wash your car in half the time now). Only your garden hose, had a weak spot but now that you have upgraded your pipes, and have better pressure, the soft spott on the garden hose is now turning into a noticible bubble in the garden hose. It is the same thing with a computer. Sometimes that extra pressure of an updated system... can cause a bubble (not a bubble litterally) but could bring out some problems that you were not aware before.


Message was edited by: Carlo TD

Aug 12, 2012 1:15 PM in response to tttxx

I am here, right now trying to give ideas to you. The first page does not mention anything that I have suggested. So it is better not to send me to the first page but keep me on this page. I understand you have an issue, but don't take it out on me, or tell me to go look at page one. I would really like to see your system working. Checking a different admin account would eliminate hardware. Checking headphones in the jack, would test if some sort of short was occuring.

Aug 12, 2012 8:33 PM in response to Lvivske

Carlo - appreciate the help. I have the same problem. There is no mass-failure of hardware going on. The suggestions you give are appropo if there is an isolated incident. This is not an isolated incident, and while some of your ideas may help find a workaround, they are not going to cure the bug in ML.


So . . . anyone have an idea when 10.8.1 is being released?

Aug 13, 2012 2:54 AM in response to tttxx

Re-posting in case it's helpful to those looking into the problem...


Installed Mountain Lion on 3.1GHz 8Gb 27-inch iMac last week and noticed audio issue for the first time yesterday when I was running EVE Online (Mac Client) and Teamspeak. Same symptoms: everything is fine for 15 to 20 minutes then both voice communications and in-game audio get very choppy indeed. Shutting down the EVE client does not improve matters for Teamspeak and vice-versa. Currently, a reboot seems the only way to temporarily fix it.


Been running the same under Lion for months without a single hitch. Now hoping a patch is realease sooner rather than later, before I get well and truly ganked 😉!

Aug 13, 2012 4:07 PM in response to tttxx

My ******* god. I never had so many problems on windows! (maybe because when I was using XP there was a 6 year gap between upgrades, but I digress)


Anyway, how the **** can something like this happen? Apple controls the hardware and software. If this was a PC, fine, with half a zillion component configs, integration naturally ***** and problems are to be expected.


This audio clipping out has been a reoccurring problem since I got this MacBook last year. Jesus.


How hard is it to give AV applications max priority - with audio on the highest of course - on CPU time and I/O?

Sound stuttering after Mountain Lion install

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