You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

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

Reply
Question marked as Top-ranking reply

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 29, 2012 2:17 AM in response to tttxx

To be fair, I thought it was a fault of my ISP - I've had a few issues in the past and to find this support chat here wasnt easy and took a few google searches ..... this was a whilst ago and everyday I go online and listen to music and hear the snap crackle and pop guys ******* about and it just gets me down ..... and yep, started happening straight after an automatic upgrade to mountain lion ........ if people call round to mine, im about to throw £1500 out the window .... apparently it seems I've done it buying an Apple .... though it seems I've bought the apple with a giant chunk bit out of it .... the kind that you really dont want to eat just put in the bin but its an expensive Apple and you have to faith...... **** testing guys and **** response to Apple owners concerns .... just when will a fix be done so people can do what they expect to do when forking out over 1.5k of their hard earned cash and sit down, chill and relax to the quality sound of music without snnna snap craccckkle and ******* poppp 🙂 !!!! come on ....

Aug 29, 2012 6:37 AM in response to tttxx

Since installing OSX Mountain Lion, I've had the same issues with random sound stutters and video stutters. The other day, I was playing a video from youtube and the audio disappeared then the video froze. I exited and relaunched safari. I had been listening to the video with my earphones- and when the file launched again- it played a very loud shreak sound that just about made me pee my pants! It actually hurt my ears!


Most recently, I've experienced random clicking noises (without any specific music or sound programs launched.) I haven't been able to find any solutions online.

Aug 29, 2012 6:59 AM in response to FrederikY

I can confirm that 10.8.1 fixed the problem (that I uploaded an audio clip of) for me, and 10.8.2 has had continued stability with zero instances since the update.


That's me.


Are we all having the same, uniform, problem, though? I mean, one user here has outbound audio recording feedback, which is an entirely different issue from what I had.

Aug 29, 2012 7:32 AM in response to tttxx

Like many here, I consider myself a power user who has spent thousands on a multitude of Apple products and expect far more than an upgrade that breaks my system. It's embarrassing. My solution has been to CCC back to Lion and the problem solved itself instantly. Poor.


This shouldnt be left to a community to navigate a fudge solution weeks after Apple have broken a large number of our top spec machines.

Aug 29, 2012 9:13 PM in response to FrederikY

The problem is present in 10.8.1 too.


I'm using Logic Pro mainly with internal audio and external Firewire interface (Focusrite Saffire Pro 40).


Incresing the buffer size improved somehow the problem but I still get sporadic crackles and stuttering even in recorded audio (ruined takes).


Unresponsive UI in Logic Pro while tweaking plugins is also a ML bug.

Sound stuttering after Mountain Lion install

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.