No sound over Mini DisplayPort to HDMI Adapter

The bug is even worse: Even if you turn mirroring on, you still won't get sound if the secondary monitor is set to some resolutions. For example, the OS detected that my secondary monitor's native resolution is 1920x1200. But with the resolution set that way, there was no sound.

But if I manually changed the resolution to "1080p", the sound suddenly started being delivered.

This is clearly an absolute mess.

I just got it to work using the Rocketfish miniDVI to HDMI converter (I bought at BestBuy and they match the Amazon price if you want a nice cheap option) and my Sony TV showed up in the shound options. Not sure if that helps much but it may be the device you are using as opposed to MacBook.

i myself went through a lot of headaches and google research, wondering why my MBP had no audio through the MDP while my brothers did. Especially when we got it around the same time. After a bunch of surfing on the web i came up with this list. Before doing random trouble shootings and buying a bunch of different adapters, first check the model of the product.

If you don't know the specific model go to "about this mac" then click the "more info" look under "Model Identifier (you should be in Hardware Overview)"

Here's the list of laptop models that support audio pass-through via MDP

MacBook Air 11" Model 3,1

MacBook Air 11" Model 4,1

MacBook Air 11" Model 5,1

MacBook Air 13" Model 3,2

MacBook Air 13" Model 4,2

MacBook Air 13" Model 5,2

MacBook 13" Model 7,1

MacBook Pro 13" Model 7,1

MacBook Pro 13" Model 8,1

MacBook Pro 13" Model 9,2

MacBook Pro 15" Model 6,2

MacBook Pro 15" Model 8,2

MacBook Pro 15" Model 9,1

MacBook Pro 15" Model 10,1

MacBook Pro 17" Model 6,1

MacBook Pro 17" Model 8,3

If you do not see your model, you might be out of luck. Hope this helps out people on this thread.

I've been around and around trying to solve this- another thread led me to a very simple solution:

From another user (Fee Fi):

This issue can sometimes be resolved by opening the Audio MIDI Setup application (located in Applications/Utilities) and changing the output setting to 44 KHz (44100.0 Hz).

1. Open the Finder

2. Applications> Utilities> Audio MIDI Setup

3. Click the drop down menu after Format and choose any of the options

When I looked at my displayport adapter specifically it was set at 96 HZ

Changing it to 44 immediately restored sound via displayport for me

For those with older Mac models that don't support sound output through mini displayport, you can purchase the Mini Displayport Male | Thunderbolt® and USB Male/Toslink Audio to HDMI® Female Converting Adapter from monoprice.com to pass both audio and video through a single hdmi connector.

"This adapter connects to a female Mini DisplayPort to provide video, a USB output to provide power, and includes a mini TOSlink to TOSlink cable to connect from the 3.5mm (1/8 inch) digital audio output of your compatible Mac® to the TOSlink input on the adapter in order to deliver true digital audio and video output to the adapter's female HDMI® port. All you need to add is a male to male HDMI® cable to connect from the adapter to your television and you're ready to view AND hear movies, games, or anything that's displayed on your Mac" from monoprice.com

Hope this helps. I have a 2008 MacBook Air and ordered this.

I had the problem where I could select HDMI as a device for sound output, but no sound would come out through the HDMI cable. It wasn't working with my LCD monitor, nor my Sharp TV.

Solution was to restart the program generating the sound (in my case, Chrome) after selecting HDMI as device for sound output.

Nice. I had to change the Midi output from 48000 to 44100 and that did the trick (Panasonic TV).

Never would have found it without your Midi tip. Thanks!

Also bought an extra HDMI adapter because I didn't think the first one worked. With this change both do. Well, no biggie, good to have one extra I guess 🙂

Did you ever resolve this problem. I have the exact same problem on my 2011 MacBook Pro. I get sound from itunes and movies in itunes but no sound on youtube or when trying to watch a Tv series online.

Thanks a lot. The logging out of the Account did the trick for me.

I was trying to connect to my HDTV via receiver and the video was working fine.

This was working in my other HDTV, but for this new HDTV, it wasnt until i logged out after checking in MIDI entries.

Thanks again!

Regards,

Raghav

Hello, I had a Mid 2009 15in Macbook Pro and only video goes through the hdmi port. I'm aware that my computer is too out dated for audio however I am very knowledgeable in the internal hardware of my Macbook (I have replaced battery, ram speed, harddrive etc.) Is it possible to install a new processor or hardware to make it work through the hdmi port? I'm aware that the audio cable works as well but I would prefer to fix this problem internally. Any help is greatly appericated thank you.

Posted on the previous page of this thread, by someone else:

For those with older Mac models that don't support sound output through mini displayport, you can purchase the Mini Displayport Male | Thunderbolt® and USB Male/Toslink Audio to HDMI® Female Converting Adapter from monoprice.com to pass both audio and video through a single hdmi connector.

"This adapter connects to a female Mini DisplayPort to provide video, a USB output to provide power, and includes a mini TOSlink to TOSlink cable to connect from the 3.5mm (1/8 inch) digital audio output of your compatible Mac® to the TOSlink input on the adapter in order to deliver true digital audio and video output to the adapter's female HDMI® port. All you need to add is a male to male HDMI® cable to connect from the adapter to your television and you're ready to view AND hear movies, games, or anything that's displayed on your Mac" from monoprice.com

Brand new macbook pro. CONSTANTLY has trouble sending audio through the HDMI on both of my TVs.

Biggest piece of crap system i've ever owned. Basically just another case of "Apple refuses to play well with others"

I'm sure you'll delete this post anyway. Feel my hatred for you before you do, though. And thank you for wasting my ******* money and time.

Are you managing to get sound even once on either TV ?

If you are, if you then move to another tv you will have to go through the process each time that you change to a different TV. For a thorough walk through please read my post (I think it's on page 2 but not sure) above on this thread. If you still cannot get it to work you could try another cable (some are notoriously bad) or use your apple care options.

I fought hard to get signed into this forum just so I could say thank you to Slugblanket. Your solution works perfectly. And put an end to months of hassle. I'd actually gotten to the point where I had reduced the amount of movies I rented through iTunes, and stopped watching movies on my TV all together, because as many people reported, the audio for the Moshi Mini adapter suddenly stopped working after about 9 months.

SlugBlanket, it's people like you that help these companies stay profitable. I wanted to make sure I acknowledged your contributions.

Thank you for your detailed instructions and your generosity.

Thank you so much for your kind words. Others on various forums have given me their knowledge freely and as a former Teacher I try to pass on my knowledge also. That said, it's still very nice to be appreciated ... enjoy those movies now 🙂