Major sound issues when connected to monitor via Thunderbolt

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Level 1

4 points

Major sound issues when connected to monitor via Thunderbolt

I have an M1 MBP on MacOS Sequoia connected to a monitor (Dell UltraSharp U2723QE) via a USB-C to DP thunderbolt cable. While KVM functions work great and the MBP can see the monitor as a sound output (and its speakers connected via 3.5mm audio jack), sound defaults to the laptop speakers. Not only does this happen, but when attempting to force the switch to the monitor as an audio output, songs skip indefinitely and don't play, and YouTube videos immediately scrub to the end as if the skip button was being pressed. This has persisted across multiple MacOS variations and only fixed temporarily by restarting the laptop while connected to the USB-C cable.

MacBook Pro 16″, macOS 15.4

Posted on May 19, 2025 4:15 PM

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Answer 1

leroydouglas

Level 10

201,916 points

Jun 26, 2025 4:47 PM in response to mttknott

mttknott wrote:

I have an M1 MBP on MacOS Sequoia connected to a monitor (Dell UltraSharp U2723QE) via a USB-C to DP thunderbolt cable. While KVM functions work great and the MBP can see the monitor as a sound output (and its speakers connected via 3.5mm audio jack), sound defaults to the laptop speakers. Not only does this happen, but when attempting to force the switch to the monitor as an audio output, songs skip indefinitely and don't play, and YouTube videos immediately scrub to the end as if the skip button was being pressed. This has persisted across multiple MacOS variations and only fixed temporarily by restarting the laptop while connected to the USB-C cable.

MacBook Pro 16″, macOS 15.4

The current stable release of Sequoia including bug fixes, security updates is macOS 15.5

Keep your Mac up to date - Apple Support

To be proactive you can file a bug report / submit your Apple Feedback here: Product Feedback - Apple

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