You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

MacBook Pro 2021 USB-C DisplayPort audio passthrough not working

Hi all,


I have a 2021 14” MacBook Pro (M1 Pro). I have connected it to a Samsung 28" Flat UHD Monitor (model LU28R550UQEXXY) via the DisplayPort v1.2 connection of a Belkin Thunderbolt™ 3 Dock Pro. Two speakers are connected to the monitor via a standard Headphone port.


I have selected the monitor as the audio output in macOS Monterey (OS version 12.0.1). Unfortunately, no sound comes out of the speakers. Rarely some sound is produced but stops suddenly.


If I connect the MacBook to the monitor directly via an HDMI cable and update the audio output accordingly, the sound is played correctly through the speakers.


Playing audio via the same setup on a Windows Laptop (i.e. connecting the laptop to the dock and the dock to the monitor via the DisplayPort) works.


The issue, therefore, appears to be specific to the MacBook.


As a workaround I can connect the speakers to the audio output on the dock, or the Mac directly; however, it is not my preferred option.


Other users have been reporting similar issues.


https://discussions.apple.com/thread/253056901


https://discussions.apple.com/thread/252778777


https://forums.macrumors.com/threads/macos-11-3-displayport-audio-problem.2293658/


https://www.dell.com/community/Monitors/U2719DC-MacBook-Pro-updated-external-speakers-no-sound/td-p/7880445


https://www.macrumors.com/2021/02/03/macos-big-sur-external-display-issues/


Can anybody assist? Thank you!

MacBook Pro (2020 and later)

Posted on Dec 6, 2021 2:40 PM

Reply
Question marked as Top-ranking reply

Posted on Dec 10, 2021 11:07 AM

This is a Montery issue. My USB-C to HDMI 2.1 adapter (uses DisplayPort Alt Mode) used to work fine on Big Sur. After upgrading to Montery, the adapter no longer plays any audio. I will try an older USB-C to HDMI 2.0 adapter which should use HDMI Alt Mode to see if that works. That should be equivalent to the native HDMI port on the new MPB.

Similar questions

1 reply
Question marked as Top-ranking reply

Dec 10, 2021 11:07 AM in response to AlessandroBer

This is a Montery issue. My USB-C to HDMI 2.1 adapter (uses DisplayPort Alt Mode) used to work fine on Big Sur. After upgrading to Montery, the adapter no longer plays any audio. I will try an older USB-C to HDMI 2.0 adapter which should use HDMI Alt Mode to see if that works. That should be equivalent to the native HDMI port on the new MPB.

MacBook Pro 2021 USB-C DisplayPort audio passthrough not working

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.