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Does the Mini DisplayPort on my Macbook Pro Carry …
https://www.sweetwater.com/insync/does-the-mini-displayport-on-my-macbook-pro-carry-audio-and-video/
A: The Mini DisplayPort spec does support audio and video transmission. However, audio is not implemented on all Macbook Pro models. In general, Macbook Pros made prior to mid 2010 do not carry audio on their Mini DisplayPort connection. Further information is available here, along with instructions on identifying the exact Macbook Pro you possess.
Does this Mini DisplayPort to HDMI connector output audio?
https://apple.stackexchange.com/questions/33620/does-this-mini-displayport-to-hdmi-connector-output-audio
Only certain Macs can output audio through the mini display port. Those that can't will need to have auxiliary speakers connected to the 3.5mm audio jack or other solution through a separate cable system. Mid 2010 or later MacBook Pros support audio through the port. Late 2009 or later iMacs also support it.
Identify the ports on your Mac - Apple Support
https://support.apple.com/en-us/HT201736
Thunderbolt and Thunderbolt 2 are not the same as Mini DisplayPort. They have the same shape, but use different symbols on the cable and port. However, this port does support Mini DisplayPort for video output, so you can use a Mini DisplayPort cable to connect a Mini DisplayPort display.
MacBook Pro (April 2009) Mini Displayport… - Apple Community
https://discussions.apple.com/thread/2415014
I have last years MacBook Pro, and was told that the mini display port only supports output to video, no audio whatsoever, not even HDMI. What a waste. Instead you have to use a cable from the headphone jack to make the sound work.
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