Previous 1 2 3 Next 35 Replies Latest reply: Oct 24, 2014 6:29 PM by 01271
gordonfrommacduff Level 1 (0 points)

Recently my fan has been coming on a lot, even when idle so I decided to have a little investigation as I am also currently suffering slowdowns as well.


Running a 17" MBP dual core (2.33ghz) (2006 MBP4 i think). Upgraded from SL to Lion 2 weeks ago.


in my Activity monitor Coreaudiod is running anywhere between 81% CPu to 120% CPU usage, 6 or 7 threads.( yes i know activity monitor max CPU for my machien is 200% as it is dual core)


Now I this is obscenly high as I am currently not running anything else and no sound is being used. This is with just activity monitor & Firefox open.

using Temp monitor it shows the following:


CPU core 1; 92-99'C

CPU core 2 : 89-90'c'C

CPU a temperature diode 94'c

CPU A proximity: 72'c


every other temp is well within normal ranges and under 60'c.


My fan now comes on within a minute of booting the MBP, I have tried resetting PRAM, SMC, have tried the common fixes of stopping CoreAudioD in activity monitor only for it to restart instantly with the same high CPU load. I have tried terminal to rename the plist for coreaudio both in my users section and the launchdeamons ( which stopped my audio completly).  although when I disabled it via the launchdeamon section my cpu temp returned to normal ( was down at 54'c even when using youtube- albeit without sound) I am at a loss. Have spent days on the net searching for solutions but they all point to an error when Coreaudiod freezes.


The machine is getting so hot I am worried it is going to do some damage.


Any ideas or help would be greatly appreciated.



MacBook Pro, Mac OS X (10.7)
  • Kappy Level 10 (265,907 points)

    In Activity Monitor select the CoreAudiod process, click on the Quit icon in the toolbar then click on the Force Quit button.


    What third-party audio software are you running?

  • gordonfrommacduff Level 1 (0 points)

    I have tried force quitting it many times. It instantly restarts CoreAudioD at 0% cpu then it jumps upto 47% then soars upto 80% again and creeps up steadily.  it list the user in activity monitor as _coreaud


    No Third party audio software runnign that I know of only running apps at the moment are activity monitor, temp monitor and firefox.

  • Kappy Level 10 (265,907 points)

    What happens if you quit FireFox? What might you be running that would use CoreAudio? Any plug-ins like Flash, iWoW, Hear, etc.?


    If you double-click on the process in Activity Monitor it will open a process window. Click on the Open Files and Ports and look through the list to see if you can identify what is running. You can also check the Console log for any relevant information.


    If you have any cache cleaning software like Lion Cache Cleaner using it to clear system and user caches may help if the problem is due to corrupted cache.

  • gordonfrommacduff Level 1 (0 points)

    with nothing running and from a "safe" ( holding shift on boot) startup the temp adn cpu % is normal.

    In a normal boot, with nothing running the CoreaudioD is still up at the same high %.


    In Firefox I have very little plug ins, Flash, divx web player, java and quicktime.


    I ma a bt confused by your ACtivit monitor comment, If i doubel click or click on inspector on the process it shows me the following under stas:

    Threads 6,

    ports 612,

    cpu time 27:07 ( time since last reset),

    Context switches 498666876 ( and rising quickly).

    page ins: 417,

    Mach messages in 67383407 ( and rising)

    Mach messages out: 126109873 ( and rising)

    Mach system calls : 99762695 ( stil rising)

    Unix system calls : 90400019 ( and rising)


    I dont seem to be able to find the bit you refer to about open files and ports.


    1ust downloading the Lion cache cleaner to see if ot makes any difference...

  • Kappy Level 10 (265,907 points)

    Sorry, apparently that isn't available.


    If there's no problem in a safe boot then that points to a preference file or cache file problem at a first glance. Something that has been corrupted most likely outside of the Home folder. Unfortunately, I'm not sure what it is. Safe mode disables third-party items such as drivers, preference panes, contextual menu items, certain plug-ins, etc. You could hunt for days trying to uncover the culprit.


    If Lion Cache Cleaner doesn't help any then I would give a reinstall a try. It should take about 45 minutes or so:


    Reinstalling Lion Without the Installer


    Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alterhatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.


    Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.


    When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.


    Reinstall Lion: Select Reinstall Lion and click on the Continue button.


    Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.

  • gordonfrommacduff Level 1 (0 points)

    I have just run LCC and did a deep clean on all the caches. Unfortunately that didnt work.

    re downloading lion , goign to do a full clean install and not just an upgrade over Snow Leopard to see if that helps.( off to plug an external HD in to do another time machine backup first though)


    Many thanks for all you help so far Kappy.I will keep you updated as to how the reinstall goes tommorow ( its now nearly 1am in the morning here ) .




  • Kappy Level 10 (265,907 points)

    Sleep well, MacDuff.

  • gordonfrommacduff Level 1 (0 points)

    Many thanks for your help Kappy,

    Re downloaded lion and stuck it onto a USB stick.


    Did a full clean install of Lion and then migrated al my apps and info from my time machine backup .

    have been using the machine for a few hours now and so far so good.


    Coreaudiod when no sounds are being played sits at 0.0% cpu and when running flash and even in youtube it hasnt gone above 3% cpu usage.


    fans arent coming on as much and the cpu is comfortably sitting at 66'C . its like ive got a new machine again as the whole system is responding quicker.


    Once angain thanks for your hep.



  • Michael.Kyllonen Level 1 (0 points)

    I actually ran into the same problem. I have updated Lion on the computer, 10.7.1. coreaudiod was going already at 110%. I started iTunes at it went to zero - quit the itunes and coreaudiod is back at 100%. So I'm running iTunes and fixing the permissions atm

  • neoplop Level 1 (0 points)

    My money is on one of the Firefox plug-ins, like java, or flash. This is what I am fooling around with at the moment. Both of those are consuming lots of CPU for no good reason.

  • Dadlov Level 1 (0 points)

    Thnx,im experienced pc user,and i see after upgrading on 10.7.1. that my macbook became much slower,on activity monitor i see coreaudio jums over 70,non stop,i was thinking that i can put down priority level as on pc,im on trip so i dont have lion dvd,so this with itunes happened to be most suitable solution.


    Thanks again,


    Damir Stipetic

  • hermanml Level 1 (0 points)



    Simply reinstall your OS. In Lion, boot up while holding Cmd+R. In older versions, boot up with the Install DVD in your mac (one of the DVDS in your macs box). DO NOT format your drive, ONLY reinstall your OS.

  • Phredb Level 1 (0 points)

    I can't believe that the answer to a widespread issue with an errant system process is to "simply" re-install our operating systems! Does the absurdity of this as a final answer not strike anyone else? Why doesn't Apple "simply" fix the coreaudiod process! I'm sorry, but this is just not a solution for me.At best it is a workaround. What will stop this from happening again amd us having to "simply" re-install the OS again and again. Until we address the root cause and how to prevent this, we are just  closing our eyes and hoping the gun doesn't go off again ;-)

    BTW- I'm not meaning to pick on you hermanml. I know your reply was sincere and intended to help others get around an ugly situation. My frustration is with "Apple" in general for not stepping up to address what has become a wide spread issue affecting very many users that has not, to my knowledge, been addressed with a sufficient explanation or fix.(I do continue to submit crash reports from both of my MACBooks to Apple). Please do not mistake this as an attempt to question your (hermanml) integrity or intent. Thank you for offering at least some soluton to this most frustrating bug (or whatever one chooses to call it). I can only hope that now that I have finally opened my big mouth and vented, the next link I find regarding this issue will require me to eat my words! At least then it would mean this is resolved ;-)

  • Pranav429 Level 1 (0 points)

    I am currently having the same ******* problem.

    My computer is experiencing either an itunes crash or coreaudiod running 115%


    i have backed up most of my data, and will now reinstall mac os x lion by using command +R while restarting.


    Hope it works.

    and I agree to Phredb, Apple should fix this asap.


    Also,i talked to apple technicians on technical support.

    after 3 calls of 2 hours, the superwiser advised me that i should reinstall Lion.


    something in the "messages beta" software seemed fishy.


    anyways hope mine works

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