I have the same issue, but it wasn't after sleeping. My issue was going to play a YouTube video and the system started having sound problems then. The volume up and down keys seem to happen for other people as well.
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27inch ACD Sound Issues
- Thread starter DBriggs
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I have the same issue, but it wasn't after sleeping. My issue was going to play a YouTube video and the system started having sound problems then. The volume up and down keys seem to happen for other people as well.
Good to hear I'm not the only one with problems. Been having the audio go out for no reason. Apple better provide a firmware fix because unplugging the ACD everytime to fix the problem is not an acceptable solution.
Happens to me on a MBP from last year everyday (work laptop), on my personal laptop (this years i7) it doesn't seem to be an issue. But everyday resume the work laptop from sleep no sound, and it also seems to cause slow downs in the response of using the up/down sound (F11/F12) buttons and the onscreen menu when sound is dead. Also, there is a thread on the Apple discussions, so I do not know how they don't know about it?!
http://discussions.apple.com/thread.jspa?messageID=12419061#12419061
http://discussions.apple.com/thread.jspa?messageID=12419061#12419061
Anyone talk to Apple in the last couple days. I have not been able to call due to work. I may call today to try and get an update on this issue.
I also have seen a great delay when using the volume up/down keys on the keyboard. Not sure if they are related or not.
I also have seen a great delay when using the volume up/down keys on the keyboard. Not sure if they are related or not.
Great...after having the display for about a week and then reading the forums and seeing this thread I went ahead and switch my sound from the Bose Companion 5 to the displays usb sound and bam...no sound.... that just sucks... I hope this issue is resolved soon by Apple, really don't want to give up the 27" for the 24" again.
Edit: Oh calling Apple Support right now. (12:42pm EST)
Edit2: Ok just finished talking to Apple support and they had me reconnect the USB and MiniDisplay Port and it works fine now and gave me a case number. I had only disconnected it for maybe 3-5 seconds. Really hope this isn't a hardware issue and a software issue instead. (1:18pm EST)
Edit: Oh calling Apple Support right now. (12:42pm EST)
Edit2: Ok just finished talking to Apple support and they had me reconnect the USB and MiniDisplay Port and it works fine now and gave me a case number. I had only disconnected it for maybe 3-5 seconds. Really hope this isn't a hardware issue and a software issue instead. (1:18pm EST)
Confused... is sound through USB or MDP
It seems that most people have sound issues keep tossing around "USB sound". According to this, http://support.apple.com/kb/HT4293, sound to the ACD is through the MDP (though USB is also avail for "Display Audio").
For those of you having sound issues, can you shed some light on which output source was used.... thanks!
This thread is really depressing me... I've been patiently waiting for this display, and sound is one of the major features I wanted it for. Now I'm patiently following this issue, still waiting to place the order...
It seems that most people have sound issues keep tossing around "USB sound". According to this, http://support.apple.com/kb/HT4293, sound to the ACD is through the MDP (though USB is also avail for "Display Audio").
For those of you having sound issues, can you shed some light on which output source was used.... thanks!
This thread is really depressing me... I've been patiently waiting for this display, and sound is one of the major features I wanted it for. Now I'm patiently following this issue, still waiting to place the order...
Attachments
Well here is my latest update, after 4 calls over a period of two weeks I just got off the phone with Apple support and they are 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.
Power Draw Issue
I have experienced the following three problems with the Apple 27 LED Cinema Display:
1. Dropped audio. Unplug "fix" works temporarily. This issue is aggravated by audio on Youtube and such.
2. Sluggish or no response from the volume controls.
3. Strange back light fluctuation when using a MBP powered by the display. I disabled all the related ambient light and energy saver settings. This issue was most obvious when the display is set to low brightness. This issue was aggravated by scrolling, opening apps etc.
Running the MBP from its own power adapter fixed the last problem, but when the audio dropped again, I returned the display.
My theory is that the power supply in the monitor fails to adapt fast enough to power demand, even if it is perfectly capable of powering the panel at full bright, playing audio over the 49 watt speakers as well as running a MBP. Such a failure would explain the back light fluctuation, zombie audio and some of the problem others have experienced like the dropped iSight.
I'll buy one if these again problems are fixed. Unfortunately, I'm convinced it is a hardware problem.
I have experienced the following three problems with the Apple 27 LED Cinema Display:
1. Dropped audio. Unplug "fix" works temporarily. This issue is aggravated by audio on Youtube and such.
2. Sluggish or no response from the volume controls.
3. Strange back light fluctuation when using a MBP powered by the display. I disabled all the related ambient light and energy saver settings. This issue was most obvious when the display is set to low brightness. This issue was aggravated by scrolling, opening apps etc.
Running the MBP from its own power adapter fixed the last problem, but when the audio dropped again, I returned the display.
My theory is that the power supply in the monitor fails to adapt fast enough to power demand, even if it is perfectly capable of powering the panel at full bright, playing audio over the 49 watt speakers as well as running a MBP. Such a failure would explain the back light fluctuation, zombie audio and some of the problem others have experienced like the dropped iSight.
I'll buy one if these again problems are fixed. Unfortunately, I'm convinced it is a hardware problem.
Nope, it can definitely be fixed with a software update. I've seen 2 of them exhibit the same loss of sound / sluggish behavior. It's very obvious that it's software related when it happens.
I've never plugged anything into the Magsafe and it happened to me. It's obvious when it does happen that it's a software problem (sluggish controls until reset, etc.).
I say it is software not hardware.
You lose the speakers usually first, then the mic, and eventually the iSight. My USB ports have a keyboard plugged into them and it has never stopped working. I quit resetting the SMC and just leave the audio out on my stereo receiver.
I hope Apple will release a software/firmware update in the next few weeks.
You lose the speakers usually first, then the mic, and eventually the iSight. My USB ports have a keyboard plugged into them and it has never stopped working. I quit resetting the SMC and just leave the audio out on my stereo receiver.
I hope Apple will release a software/firmware update in the next few weeks.
Some observations
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:
You can make this message appear on demand by attempting to change the volume.
Hope they have a fix for this soon. I'm more optimistic now that I see people have the same problem with newer Macs.
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:
Code:
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)You can make this message appear on demand by attempting to change the volume.
Hope they have a fix for this soon. I'm more optimistic now that I see people have the same problem with newer Macs.
Yeah I am not sure if that one supports it. I know all the new ones from this year do, but not sure about the 2009 models. I would hope they do but unless there is someone else with it working on the same/similar model I would say there is a good chance it doesn't support it if it isn't working. Oh and be sure you aren't using any MDP extension cables, another thread revealed that can cause MDP audio to not work.
I just downloaded a software update a few days ago for the 27" ACD. It fixes all of sound issues I was having. Thanks, Apple!
Having the same audio problems etc. with my new 27" LED cinema display. I use it with an '09 MacPro.
I stumbled on the unplug fix myself, but this is only temporary. I reset the SMC today for the first time and it solved the audio issue. I hope this fixes the problem permanently, but I remain pessimistic. I'll probably know by later today or tomorrow...
I stumbled on the unplug fix myself, but this is only temporary. I reset the SMC today for the first time and it solved the audio issue. I hope this fixes the problem permanently, but I remain pessimistic. I'll probably know by later today or tomorrow...
The problem will come back. It can take 3 days or so, but eventually it will. If you're using USB for audio, the problem doesn't go away.
I'm using external speakers connected via the headphone jack and I still get the problem! Very reproducible: given any reasonable length of time the sound WILL cut out. At least for me it is definitely software related as it doesn't manifest itself when running under bootcamp.
i'm having the same problem on a 2009 13" MBP. the support person told me (lied?) that they can't send me a monitor that i have to drive an hour away to a service place yeah right!! its 2 days old. i smell a lie. some of you have gotten new monitors sent out haven't you?
The trouble is, even if they send you a new monitor, the new one will have the same problem. I suggest you wait until Apple releases a software fix for the issue. Or just return it for a full refund and wait until Apple fixes the issue before purchasing it again.
Well maybe I'm just lucky, but my display has been running like a champ. No sound issues, no yellowing or backlight bleed through, no dead pixels, and no sound issues. Keeping my fingers crossed though lol...
I was having a bit of the flickering/dimming screen, but the update fixed that.
I was having a bit of the flickering/dimming screen, but the update fixed that.
quick recap of what is reported in now 5 threads in various forums:
- the problem occurs when the ACD-sound is connected via USB instead of MDP (possible only in mid-2010 models or later)
- the symptoms are/can be: sound output stops, sound input stops, sound input moves back to MBP, onscreen level indicators react sluggish, video playback becomes sluggish or freezes, CPU load is maxing out - fan revs are going through the roof (only some machines)
- the problem occurs on: MB, MBP, Mini and even Windows 7 PCs (!!)
- the problem can be fixed only temporarily by: resetting SMC, unplugging (incl. power) of the ACD, deleting various .plist files in preferences
- the problem re-occurs, depending on use, after 2-10 days
- people, who had their screens replaced by Apple continue to have the same issues with the replacement displays
- LED Display Software Update 1.0 does not fix the problem
The fact that the problem now occurs not only across Macs, but also affects Windows machines seems to indicate that this problem is hardware related and not just a driver issue. There probably is either a batch production flaw or an inherent design flaw going on with the 27" ACD.
Discussions are now filling 5 threads in numerous forums, with 5 pages alone at the Apple support forums (http://discussions.apple.com/thread.jspa?messageID=12513427#12513427).
I personally expect another 27" ACD to arrive tomorrow, but have little hopes that this display will perform any better that the one i already have. In the past two weeks i tried all 'fixes' put forward by various people and have experienced the issue 6 times myself.
APPLE, CAN WE HAVE SOME FEEDBACK? I'm getting incredibly annoyed with support guys who say (pretend) that this problem is complete news to them and always suggest to further monitor the system or have the display replaced eventually (which we know so far, does not fix the issue).
Maybe a blog needs to write about this first. MacRumors, aren't you guys affected yourselves? Please someone make Apple reply & act.
- the problem occurs when the ACD-sound is connected via USB instead of MDP (possible only in mid-2010 models or later)
- the symptoms are/can be: sound output stops, sound input stops, sound input moves back to MBP, onscreen level indicators react sluggish, video playback becomes sluggish or freezes, CPU load is maxing out - fan revs are going through the roof (only some machines)
- the problem occurs on: MB, MBP, Mini and even Windows 7 PCs (!!)
- the problem can be fixed only temporarily by: resetting SMC, unplugging (incl. power) of the ACD, deleting various .plist files in preferences
- the problem re-occurs, depending on use, after 2-10 days
- people, who had their screens replaced by Apple continue to have the same issues with the replacement displays
- LED Display Software Update 1.0 does not fix the problem
The fact that the problem now occurs not only across Macs, but also affects Windows machines seems to indicate that this problem is hardware related and not just a driver issue. There probably is either a batch production flaw or an inherent design flaw going on with the 27" ACD.
Discussions are now filling 5 threads in numerous forums, with 5 pages alone at the Apple support forums (http://discussions.apple.com/thread.jspa?messageID=12513427#12513427).
I personally expect another 27" ACD to arrive tomorrow, but have little hopes that this display will perform any better that the one i already have. In the past two weeks i tried all 'fixes' put forward by various people and have experienced the issue 6 times myself.
APPLE, CAN WE HAVE SOME FEEDBACK? I'm getting incredibly annoyed with support guys who say (pretend) that this problem is complete news to them and always suggest to further monitor the system or have the display replaced eventually (which we know so far, does not fix the issue).
Maybe a blog needs to write about this first. MacRumors, aren't you guys affected yourselves? Please someone make Apple reply & act.