os X yosemite keyboard volume not working

I had the same issue after upgrading to Yosemite, but figured it out yesterday.

Upgrading to Yosemite caused some applications to stop working and some of these were set to open at login.

I went to System Preferences/Users&Groups/Login Items and simply selected programs that were set to open at login and deleted them. The ones I deleted were the ones that no longer worked.

This fixed the problem for me, I hope it works for you all as well.

Same issues here but none of these things seem to fix it for me.

Since upgrade to Mavericks, I can't use keyboard function keys to adjust volume on MBP headphones output. I play loads of music from the Finder and this is a real pain for me. I plug a 1/4 cable from the headphone jack to my mixer in my studio and I get a very low volume. I used to use the function keys hundreds of times a day. I've read about how now you are supposed to use the volume from iTunes etc but this is from the Finder and there is no volume control without this ability. Anyway, if I was just pluging in actual headphones most of them don't have volume so why would Apple make it this way. Anyone know a way to get it back? I use a new 2014 MacPro for my main music production.

Can anyone confirm that we can no longer use the volumes keycoms when you plug in headphones and play audio from the finder, or does it work for you? I scan though thousands of samples sometimes looking for the right sounds and the levels are all over the place.

Thanks

MacBook (13-inch Late 2008), Mac OS X (10.4.11), MacPro 6 core (2014) - 2009 MBP

You might want to consider starting a new discussion. Since this one is marked solved, less people are likely to look at it. You can link to this one.

Same issue here. less then a week old and I'm seeing these dramas

will book a Genius Bar appointment

This has solved my problem!

I have reset my laptop and then put the command into terminal

sudo killall coreaudiod

and it worked.

Hope it wont happen back again when I reset my laptop.

Anyway, thanks for your support!

I just purchased MBP 15 spent 4K total 1TB SSD and Did my Time Machine Restore of my previous system and now i'm having Volume control issues With Volume button not controlling Volume at all and When i try to Log out of user account to shut down the computer just goes to my Desktop pics and doesn't shut down or restart i constantly have to force Power down took to APPle store showed them the issue they gave me another brand new system out the box right there in the store took it home did Time Machine again all night and low and Behold the vey same issue Volume button is crossed out with an Circle and have to be going back and forth to system Preferences Volume output control & use that volume control which keeps greying out on and off,somethings definitely wrong here...Cant Shut down without force powering off the laptop and volume issues is there anyone who knows whats going on here Volume gets really low also and then jumps to higher volume back & fort.el help help anyone!!!!

After trying all the previous tips, your suggestion did the trick. Thanks for sharing this.

Unfortunately this is not rue for me - under Mavericks the volume control on my Apple Monitor over my wl keyboard worked - after "upgrading" to Yosemite this function is not available any more!

I was having an issue where selecting an Airplay device the volume keys would be working fine. However going back into audio preferences and selecting internal speakers meant that the keyboard volume would not work. Doing this worked perfect, thanks for that 🙂 the command reset the system in some way and everything is now back as it should be.

Thanks, this worked for me!