USB Audio stopped working on 27" ACD after software update 1.0

Question

Level 1

4 points

USB Audio stopped working on 27" ACD after software update 1.0

Hi all,

My 27" ACD worked flawlessly until I installed 27-inch LED Cinema Display Software Update 1.0 earlier tonight. I have a unibody MacBook Pro that doesn't output audio from the mini displayport, when I got the ACD Friday, USB audio output worked fine. I also have a 24" ACD and audio worked fine on that as well. But after software update 1.0, I can no longer get audio output of the 27" ACD to work via USB, I even rebooted my Mac and it still doesn't work. After trying it a few times in Sound.prefPane, I now can't even select the "Display Audio - USB" option (when I click on it it reverts to the other option right away).

From /var/log/system.log, I believe this is the error related error message:

System Preferences[332]: Error ^P trying to set sOut device to 264

Message was edited by: ayn

MBP, Mac OS X (10.6.4)

Posted on Sep 25, 2010 10:29 PM

Reply

Answer 1

Sep 28, 2010 7:10 PM in response to ayn

I have the exact same problem.

Reply

Answer 2

Sep 29, 2010 9:32 AM in response to ayn

Called apple today and they are sending me a replacement... they did ZERO trouble shooting and just sent me over to get a replacement monitor. Very odd they didn't do any diagnostics unless this is really a problem that is known.

Reply

Answer 3

ayn Author

Level 1

4 points

Sep 29, 2010 11:14 AM in response to ayn

Apple contacted me last Sunday and I ran an app and sent them some diagnose info, USB audio works with my other MBP, and also now it started working with my MBP that didn't work before. So I re-ran the app and sent him all the disk images for reference. I haven't heard back from Apple yet.

It's weird that they just sent you a replacement right away, my display appears to work fine now and it's been perfect, so maybe it was just a weird software glitch. I'd still like to hear from Apple to understand why it happened and if there is a real problem with the display though.

Reply

Answer 4

reichea

Level 1

10 points

Oct 1, 2010 8:12 AM in response to ayn

+"Apple contacted me last Sunday and I ran an app and sent them some diagnose info..."+

Can you specify what "app" you ran, please? Thanks! 🙂

Reply

Answer 5

Oct 12, 2010 9:59 AM in response to ayn

I'm having the same issue. I'm able to get it to work if I unplug the monitor from the power source and then plug it back in.

Reply

Answer 6

noision

Level 1

0 points

Oct 12, 2010 11:03 AM in response to Ryan Hodges1

Same exact problem and same not too cool fix: unplug. After a few hours it turns off again.

It is connected to an Imac. When I switch the sound back to the iMac, all the previously non-heard sounds, like 20 email sends, bings, etc all stream through like they were waiting in line to get out. Pretty funny . . and sad.

Reply

Answer 7

Mictons

Level 1

8 points

Oct 15, 2010 12:14 PM in response to noision

They have you run system profiler and send it to them. I just got off the phone and after 4 calls over a period of two weeks Apple support is sending me a new monitor. This makes me think this issue is not software related so if you are having this issue I suggest you get calling and call every time it occurs, that is what I did. I will let you know when I receive the new one and if it has the same issue.

Reply

Answer 8

ayn Author

Level 1

4 points

Oct 15, 2010 12:28 PM in response to ayn

I haven't heard from the Apple guy for a while, the USB audio works most of the times for me now, but it's intermittent. Not too worried about it but would like to see a fix (or replacement) before my warranty runs out.

Reply

Answer 9

Oct 19, 2010 3:06 AM in response to ayn

Same problem here,.. only solution is to unplug all 3 plugs and plug them in again…
Did anyone got a response from apple?

Reply

Answer 10

Oct 20, 2010 7:51 AM in response to ayn

I have this problem too. I have the 27-inch LED cinema display connected to my Mac Pro 1,1 via the Radeon 5770. I also suspected it had something to do with the machine going to sleep, but the audio doesn't disappear every time it goes to sleep. Unplugging the monitor fixes the problem.

I also noticed that when the sound has went away, if I try to change the volume there will be a long delay before seeing the volume-change graphic. Also, toggling the sound device in System Preferences while the problem is in effect is unresponsive, sometimes giving the beach ball. Finally, this message is seen in console logs when the sound has went away:

10/19/10 6:01:22 PM kernel USBF: 75053.200 AppleUSBEHCI[0xf3d0800]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 5, EP: 0)

I can make this message appear on demand by attempting to change the volume.

If (when) this happens again, I'm calling support.

Reply

Answer 11

ayn Author

Level 1

4 points

Oct 21, 2010 1:04 PM in response to Ricky Egeland

Hi Ricky,

Yes my 27" ACD exhibits the same behavior as you described, when it wakes from sleep, the USB sound subsystem stops functioning, this includes the speakers and mic on the ACD. Only way to fix it is to unplug and replug it.

I just pinged the guy from Apple who contacted me, but haven't heard back from him for a couple of weeks.

-Andrew

Reply

Answer 12

Nov 8, 2010 7:14 PM in response to ayn

So what's going on with this?? We need a solution.

Reply

Answer 13

Mitch 751

Level 6

11,624 points

Nov 9, 2010 3:00 AM in response to jamesryanbell

do we believe that the update caused the problem, if so, is there any way to revert to the previous ?

Reply

Answer 14

Mitch 751

Level 6

11,624 points

Nov 9, 2010 11:11 PM in response to Mitch 751

See if this helps, I tried that and have been working for more than 24 hours

Open the Audio Midi Setup -> Go to Display Audio (or LED in some case), change the Output settings:-

Format : 48 Hz 2ch-24bit

No sure it solves but still under testing, so far so good

Reply

Answer 15

Nov 15, 2010 12:31 PM in response to Mitch 751

You posted that last post on November 9th. Have you had any more problems?

Reply