Does Mac Mini M4 Support DP Alt mode?

I recently purchased Mac Mini M4 (512 GB) Model. I am using a Benq EX3210U Monitor ( which support HDMI 2.1 and DP 1.4 ). There is some issues when I connect Mac Mini and Monitor using HDMI. As the monitor supports DP Port, I purchased Cable Creations USB-C to DP Adapter. I have verified with Cable Creations that the adapter supports audio. I have also verified the same by connecting to a windows laptop and I am able to receive audio through Monitor Speaker using DP USB-C to DP adapter.

But when I connect the same with Mac Mini M4 I am not able to get audio through Monitor Speakers. So when I researched I found for DP to support audio, Alt Mode should also be supported.

So does Mac Mini M4 Thunderbolt 4 ports ( ports at the back, I tried connecting to ports at the front. I guess they don't transmit video/audio) support DP Alt Mode?

Also, If there is any solution to make audio work using DP 1.4, please do share.

Thanks in advance.

Abhilash D K

Mac mini, macOS 15.3

Posted on Mar 21, 2025 05:28 AM

Top-ranking reply

MartinR

Level 7

23,517 points

Posted on Mar 23, 2025 07:20 AM

den.thed wrote:

Just because that USB-C to DisplayPort adapter works with a PC and an Intel MacBook Pro, doesn't mean that it will work with a cable picky silicone Mac.

What I would do, is test a short high speed 8K Thunderbolt 3/USB-C to DisplayPort cable.

for example: https://www.amazon.com/dp/B08B3SB5VC/ref=sspa_dk_detail_4?

Agreed, it would be worthwhile to test the setup with a different adapter.

The strange thing is that in the OP's present setup the M4 mini recognizes the Benq monitor as an audio output device (which would seem to indicate the adapter is doing its job) ... but the audio level sliders in Audio MIDI setup are at their zero position and the OP is not able to adjust them.

I'm going to suggest that the OP also try using an HDMI connection between the Benq & the mini. If audio also doesn't work via HDMI then a hardware problem in the mini becomes suspect.

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Does Mac Mini M4 Support DP Alt mode?

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