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  • Designer Gav UK Level 1 (0 points)

    MSM126 - have you tried booting then 'sleeping' MBA independently, then plugging in TB and waking the wafer thin chap? Worked for me whilst I kept up the routine but lately I forgot and, bless me, the bloody sound works fine now...

    When I first got MBP + TB I received the advised TB software update which never would install - I never did ask if this was installed by anyone here successfully?

  • MSM126 Level 1 (10 points)



    Yes, I should have made that clear ... the work around resolved the problem for me; though like others here it was a temporary fix.  I spoke with AppleCare.  They took me few quite a few things, then did a quick and then extensive hardware test.  Apple is aware of the issue, but don't seem to have a fix on the cause or a resolution.


    I have about 10 days left in my return window.  I'll just return both the display and the MBA, and switch back to my MBP (mid 2009) if I'm still seeing the issue this weekend.  Then I'll just wait to see what happens when the dust settles on the issue.

  • Matt in LV Level 1 (0 points)

    The soultions offered in this thread didnot help me, but I was able to go into


    system preferences -> Sound -> Output -> USB Audio


    Although I did just update the Thunderbolt drviers today, this is something that should be automatic when plugging in a MBA to the display.

  • TheresAni7InMyMac Level 1 (0 points)

    I found this out on accident. Hold ALT/OPTION and left click on the volume....thing.... on the top right of your screen, if its not there you can put it there in system prefrences>sound and it says show volume in status bar with a check box next to it. Then you will get input and output options to appear. If this doesnt work immediately sometimes if you try again a few times it will pop up.


         Ask if you have any questions


    edit** under output in the pop up thing, internal speakers are the things you hear music from when no headphones are plugged in........ and whatever it says below that is most likely your external displays speakers.

  • weicheng28 Level 1 (0 points)

    I had a wishful thought that perhaps Apple would secretly address the problem in their new OS X Mountain Lion.
    After rushing to put the new cat on the Air (2011), I realised that this cougar, like it's cousin Lion, cannot roar through the display most of the time.

    To all those who share the same deam, Mountain Lion doesn't have the solution, yet...Sigh

  • Moi1964 Level 1 (0 points)

    You saved my day

  • TheresAni7InMyMac Level 1 (0 points)

    your welcome good sir. apple made the ways to do it, they just were hiding it

  • Mike Antos Level 1 (0 points)

    This was the answer, thanks.  Wish I could figure out how to mark this for Solved My Question points...

  • IPv6Freely Level 1 (0 points)

    This isn't really helpful, since the input/output options are already easily found within System Preferences > Sound.


    The issue is that my Thunderbolt display (Display Audio) isn't listed as an output option at times.


    Since the Display Audio option is shown as "USB", I have to believe that an earlier poster was correct in that it is a USB issue.


    Screenshots before/after a reboot:


    Screen Shot 2012-08-07 at 10.38.17 AM.png

    Screen Shot 2012-08-07 at 10.41.48 AM.png

  • Moi1964 Level 1 (0 points)

    Hi IP,


    I looked in that part 2 and thought there must be the problem until i did the "Hold ALT/OPTION and left click on the volume....thing.... on the top right of your screen" and see more/other options then showed in the system Preferences sound. I am now not behind my Thunderbolt but will upload the screenshot tomorrow if this would help.


    Screen Shot 2012-08-07 at 7.55.22 PM.png

    Screen Shot 2012-08-07 at 7.56.12 PM.png

  • IPv6Freely Level 1 (0 points)

    I'm not sure what you're trying to say...


    The option+click doesn't really accomplish anything that isn't easily done via the sound pane in preferences. But that's completely irrelevant to the problem. It doesn't "fix" anything. Being able to look at my input/output devices in that manner isn't helpful if the device (the Thunderbolt display) isn't in that list. After a reboot, it was.

  • Moi1964 Level 1 (0 points)

    Well it solved my problem with the sound on the thunderbolt display. As you can see on the screenshot the 2 things show complete different possible setups where i thought also that the preference would show all.


    Is the system sound through the Thunderbolt display ? or there is no sound at all. In my case the system sound was through the Thunderbolt but any music or movie sound with through the Mac speakers.


    This happend after I updated to Mountain Lion by the way. It just changed the confiruration.

  • IPv6Freely Level 1 (0 points)

    The thunderbolt display wasn't being listed as an output device at all, regardless of where I looked for it.

  • richiebuttle Level 1 (0 points)

    Yes the Hold Alt trick on the sound problem does work IF the option is actually listed


    The problem is that the option is simpliy not there all the time. Some times you have the plug out the thunder bolt cable for a few seconds and plug it back it to pick it up.


    The display might work, but it may not always give out sound. When the sound does not work, then none of the USB ports do not work. It's a major pain when you have printers connected to the screen.


    The problem seems to be a lot worse since the upgrade to Mountain Lion for me also.

  • IPv6Freely Level 1 (0 points)

    Correct, it's clearly a USB issue.