Q: Volume control problem in Lion

Thanks Bjarne. But my problem is that I can't my computer

sorry, my mistake , maybe if you have a install medium, like snow leopard (I think snow leopard installer is able to mount the lion filesystem) then you open terminal in the installer, and mount the FS (use diskutil to locate the partition), and copy the downloaded file from an usb drive

if you havent got any install medium it is an dead end...

the recovery discs have the terminal feature - i guess...

maybe this can help you to get a terminal up and running

edit: now with link :  http://support.apple.com/kb/dl1433

I have two Macbook Pro early 2010's one with an SSD and one without, only the one with the SSD has this problem.

This fixes the problem instantly but temporarily ie it comes back from time to time (Thanks bjarnehr )

terminal:

sudo -i

"enter your password"

as root :

launchctl stop com.apple.audio.coreaudiod

launchctl start com.apple.audio.coreaudiod

Same problem here, same setup (1 with SSD and another with a 320 HD) and only the one with SSD has the problem.  Installed the update, restarted once, no go, restarted again, success!  Shut down for the night, and on the next morning, problem came back.  No audio control...  Since I always have an earphone handy, my temporary solution is to plug in and out, then it works fine.  I'll wait for another update before messing with command lines.

I had the same problem and fixed it on a MacBook Pro 13" using a combination of the methods explained here:

1.  I enabled the F1, F2, etc keys to function as standard function keys option.

2.  I held down the fn key and the shift key to increase/decrease volume  (using fn+shift let's you increase/decrease volume without the sound effects.

3. I plugged in earphones and played a song on iTunes then increased/decreased volume via keys + fn-key

4. I unplugged the earphones and set the function keys back to the previous behaviour and the sound controls worked fine ever since, even after restarts

hth

changing false to true, worked for my mbpro 2009(?). surprised such things sometimes slip through without immediately getting fixed.

Setting false to true worked for me, resetting PRAM, didn't (as well as rebooting didn't). Plugging headphones seemed to help sometimes.

Tried editing the Launchdaemon file and it didn't work.

I have a 13" Mid 2009 MBP. Problem started after installing Lion on a new SSD. Changing the coreaudio plist under root worked like a charm. Thanks!

I'm using Lion Update 10.7.2 even before the official 10.7.1 update was released - since update to 10.7.2 no problems anymore! Reading your comments shows 10.7.1 did not help ?

You can do as suggested above with an elevated TextEdit session.  Then, copy and paste the original contents of the .plist file into a new file, save as a backup.  Paste the following into the original, now empty file, and save it.  You may have to reboot.

The contents come from a working Snow Leopard mini, but fixed the issue on my 2010 MBP i7. The mini is an '07 Core2Duo that I own.

Here is the contents of the file:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

<key>EnableTransactions</key>

<true/>

<key>Label</key>

<string>com.apple.audio.coreaudiod</string>

<key>ProgramArguments</key>

<array>

<string>/usr/sbin/coreaudiod</string>

</array>

<key>KeepAlive</key>

<false/>

<key>MachServices</key>

<dict>

<key>com.apple.audio.coreaudiod</key>

<dict>

<key>ResetAtClose</key>

<true/>

</dict>

</dict>

<key>UserName</key>

<string>_coreaudiod</string>

<key>GroupName</key>

<string>_coreaudiod</string>

</dict>

</plist>

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"><plist version="1.0"><dict> <key>EnableTransactions</key>     <true/>     <key>Label</key>     <string>com. apple.audio.coreaudiod</string>     <key>ProgramArguments</key>     <array>      <string>/usr/sbin/coreaudiod</string> </array>     <key>KeepAlive</key>     <false/>     <key>MachServices</key>      <dict>      <key>com.apple.audio.coreaudiod</key>      <dict>      <key>ResetAtClose</key>      <true/>      </dict>     </dict> <key>UserName</key>     <string>_coreaudiod</string>     <key>GroupName</key>      <string>_coreaudiod</string></dict></plist>

Good luck all, this issue had my brain broken.

You can see my post above or also try creating a backup of the plist and then deleting the file altogether.  Reboot and see if that helps.

.plists are just preference files and should be recreated automatically on reboot. 

I did not try the delete method, and when I pasted the code from my Mac Mini's file, it worked just fine without even a need to reboot. 

Keep in mind my MacBook Pro did not have Internal Speakers listed at all in System Preferences, and it just happened all of the sudden today.  Lion was working fine for about a week after I did a clean install.

It is now back to normal, and it worked through a reboot so the change is persistent so far.

Good luck.

Automatic solution:

If you want to make it automatically (i.e. to automatically repair your vollume control on each restart),

you can make the following script in AppleScript Editor (copy and past the text into AppleScript):

do shell script "sudo -i launchctl stop com.apple.audio.coreaudiod; launchctl start com.apple.audio.coreaudiod" password "YOUR ADMIN PASSWORD" with administrator privileges

Don't forget to substitute "YOUR ADMIN PASSWORD" with your real admin password!

Save it as "audio-control.app" (File Type: Application) to Applications folder.

Then open System Preferences > Users and Groups, go to "Login" tab and add this script to the list.

It should work like a charm. Your audio control should be OK on each restart.