Sound stuttering after Mountain Lion install

After some testing he said everything works fine, no soundstuttering!

He had sound stuttering after watching video a long time in fullscreen.

His Machine:

iMac 27" Mid 2011

3,4Ghz i7

16GB 1333Mhz RAM

Radeon HD 6970M 2048MB

Looks like the graphic driver was faulty.

I was wondering about graphics since the problem shows up more than anything in Photoshop, watching video, and games, all of which use the GPU (at least I think video does, depending on the player). Photoshop's bristle brushes are especially good at making it cut out.

Also I use istat menus and the graph that monitors how much GPU memory is being used is broken in 10.8.

I don't get how this has gone so long without a fix though.

Do all of us have the 2GB radeon? I think that's a pretty rare option.

Ive also seen a post on another site saying that 10.8.3 does not fix sound issues, fwiw (hopefully worth nothing)

Thanks. I have the same specs with a 2 tb hard drive and the 256 SSD. Not holding my breath, but it would be nice.

nyso wrote:

After some testing he said everything works fine, no soundstuttering!

He had sound stuttering after watching video a long time in fullscreen.

His Machine:

iMac 27" Mid 2011

3,4Ghz i7

16GB 1333Mhz RAM

Radeon HD 6970M 2048MB

Looks like the graphic driver was faulty.

That's the same spec as my iMac. If this problem is indeed a graphics driver issue it would make a lot of sense. The issues I have are sometimes caused by doing things in Photoshop and other graphics apps. It would also explain the cursor lag and occasional kernel panics.

I've spent more time than I can afford checking over everything a few times now, Rmber, Hardware tests, resetting NVRAM etc. no hardware problems as far as I can tell. Have also run iTunes for a few days on my MBA which doesn't seem affected by this issue and considering it has different graphics hardware would again make sense.

Really hoping 10.8.3 does the job so we can all get on with enjoying a smoother OSX 10.8.

Thanks for letting us know.

designaholic wrote:

nyso wrote:

After some testing he said everything works fine, no soundstuttering!

He had sound stuttering after watching video a long time in fullscreen.

His Machine:

iMac 27" Mid 2011

3,4Ghz i7

16GB 1333Mhz RAM

Radeon HD 6970M 2048MB

Looks like the graphic driver was faulty.

That's the same spec as my iMac. If this problem is indeed a graphics driver issue it would make a lot of sense. The issues I have are sometimes caused by doing things in Photoshop and other graphics apps. It would also explain the cursor lag and occasional kernel panics.

I've spent more time than I can afford checking over everything a few times now, Rmber, Hardware tests, resetting NVRAM etc. no hardware problems as far as I can tell. Have also run iTunes for a few days on my MBA which doesn't seem affected by this issue and considering it has different graphics hardware would again make sense.

Really hoping 10.8.3 does the job so we can all get on with enjoying a smoother OSX 10.8.

Thanks for letting us know.

Yeah, my bet is on the graphics driver also. Although curiously enough, it has never crashed while playing games (COD4, black ops, minecraft, tf2 - none of them have had issues).

I also happen to have the 2GB version of the 6970 — it seems a lot of us have it. I wonder if it's a problem unique to the 6xxx cards, or if it's a problem only with the 6970...

It could be. I also have a 2011 27" iMac with AMD Radeon HD 6970M card.

If I'm watching a movie that starts stuttering (for example, on youtube) and I start scrolling the window, the stuttering multplies the more (or faster) I scroll.

I don't know if everyone (or if even a majority) of people in this thread are using a 6970, but at least for some of us, it's a common component.

This occurs, as we all have found, only with ML, so it isn't a hardware fault, per se, but a software driver issue.

Of course, this isn't the only problem: Even when I'm watching no movies and not scrolling, my entire iMac becomes 100% unresponsive (locks up) for 5-10 seconds, then continues. Many others in this thread have noticed the same issue.

dcollett.seattle wrote:

It could be. I also have a 2011 27" iMac with AMD Radeon HD 6970M card.

If I'm watching a movie that starts stuttering (for example, on youtube) and I start scrolling the window, the stuttering multplies the more (or faster) I scroll.

I don't know if everyone (or if even a majority) of people in this thread are using a 6970, but at least for some of us, it's a common component.

This occurs, as we all have found, only with ML, so it isn't a hardware fault, per se, but a software driver issue.

Of course, this isn't the only problem: Even when I'm watching no movies and not scrolling, my entire iMac becomes 100% unresponsive (locks up) for 5-10 seconds, then continues. Many others in this thread have noticed the same issue.

I have seen the issue when using the computer normally, but a disproportionate amount of the issues ocured when I watched videos on YouTube...

Scrolling caused more of an issue sometimes, but it was pretty much random for me, as just moving the mouse around caused issues.

The lockups I've seen tended to be around 1-3 seconds long, and the few lockups that were longer than that almost always resulted in a kernel panic (blackscreen then instant restart, crash reason is the spinlock one).

6970 with 2 gigs as well. Cursors jumps, audio stutters, lockups, etc are all random.

Jupp, 2GB here, too. — I think we got it ;)

Perhaps Apple will pay attention to the importance of Video card drivers now. What do they spend all day doing anyways? Integrating stupid features from iOS that have little value on a desktop? Give us touch on the desktop and then there may be value.

My audio stutters and my mid 2010 mbp has an nvidia 330gt in it.

I Have installed the new 10.8.3 update Itunes running movies, playing wow, encoding a dvd at the same time not one single blip. PERFECT imac 27 inch mid 2011. Only bit different is i use a SSD. Very happy. i got the update from torrent lets see how long this lasts before apple remove it. Rest assured they have fixed it by the looks of it

I have 6970m 1GB and have all these problems too: cursors jumps, audio stutters, lockups so this isn't problem with 2GB only.

same - 6970 + 12GB 1tb hard drive. Stutters after 3-15min with itunes and netflix, but only when fullscreen or very large. VLC is smooth though, but I'm usually watching low-bitrate content with that app.