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
1,223 replies

Sep 20, 2012 8:02 AM in response to FrederikY

Keep us appraised. I've talked to Level 2 tech support over 6 times since release, and other departments. So far, nothing yet other than to have the computer taken to the genius bar. Which I'm not doing because it's doing it on both of my computers and started immediately at the same time and it doesn't do it under Snow Leopard. But I can't use SL because certain apps won't work.


This is definitely Apple trying to compete with Windows Vista for worst OS in a while. So far, they have a good shot by me.


Things I've noticed trigger the audio stutter, video stutter, and cursor jumping on my USB mouse are screen saver activation/deactivation, email coming in, opening applications, and any other sudden change in system activity. It doesn't have to be a heavy load or process either. Usually it's pretty medial tasks that initiate it.


Also, I do have a Thunderbolt display attached to my iMac, which I doubt would have any influence. But I throw it out there to see if others might also have an external display that might be influencing this behavior. Again, very doubtful though.

Sep 20, 2012 11:20 AM in response to tttxx

I emailed Mr Cook himself on Wednesday and low and behold i got a nice lady on my phone today explaining that she has been asked to contact me and arrange a member from the senior technical support team call me regarding the Mountain Lion problem with iMacs.



So with that i would like to let everyone know that apple are on the case and Mr Tim Cook does read his emails.




Thank You apple!

Sep 20, 2012 1:02 PM in response to Merls1003

Not to burst your bubble, but I also contacted executive relations about a month ago. When I spoke to them they set up a technician to contact me by phone which led me to three more technicians contacting over the curse of two weeks and were unable to do anything. They had me make modifications to the operating system, run a DMG file for an image capture, and a few other changes which ultimately led to the operating system becoming completely unstable forcing everything to have to be wiped on the computer and a fresh install performed.


After this yielded no results, the Apple executive relations person told me that I need to take both of my 27 inch iMacs to Apple so that the Genius Bar could run more tests and diagnostic on the computers. Despite my referencing this Apple discussion post, the fact that the problem did not exhibit itself undersell Leopard, or under Boot Camp Windows, and that the issue was clearly related to only Mountain lion, They were of no further help.


Hopefully will get further than I do, and if you get please post back with what you find if anything results in a fix. Best of luck.

Sep 20, 2012 2:01 PM in response to tttxx

I updated to 10.8.2, sadly still having troubles with fast-forwarding followed by stuttering audio. But I wanted to share a temporary fix.


Close the file and reopen, and that works. But that loses my spot so that was getting annoying. I found out I could go to Trim mode (command-T) and back out, and the audio would fix itself. (And not lose my spot.) (< On an individual basis. It usually breaks again sometime the next video.)


Don't know if this will work for anyone else but it's worth a shot 🙂


(I'm on a 2012 MacBook Pro 15")

Sep 20, 2012 3:30 PM in response to BarrettF77

Have given up even attempting to listen to music via my iMac. Just more concerned about the overall system performance - three freezes tonight, the computer did not auto reboot but did freeze for around 30 seconds on each occasion.


Will be contacting Apple tomorrow, requesting a refund and details on how I can reinstall Lion and get this current cr*p operating system off my computer. Feeling pretty disgusted at the moment, completely unacceptable that an Apple product doesn't function on a £2,200 Apple computer.

Sep 20, 2012 11:05 PM in response to tttxx

Just did the 10.8.2 update......of course same problems. Audio stuttering / crackling / then cuts out completely along with mouse pointer jumping and graphical stuttering. Exit whatever program I am using and wait about 30 secs and problem clears. Only to heppen again, when utilizing program again. Also, does not matter what I am doing (youtube, itunes, WoW, D3, StarCraft)......here are my specs and I too submitted feedback.


Mid 2011 27" iMac

Processor 3.1 GHz Intel Core i5

Memory 4 GB 1333 MHz DDR3 (Apple installed, never been upgraded)

Graphics AMD Radeon HD 6970M 1024 MB

Software OS X 10.8.2 (12C54)

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Sound stuttering after Mountain Lion install

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