Hello everyone,
I am currently running the macOS Golden Gate 27 Developer Beta and am experiencing an issue with external displays.
I am only able to connect one external display successfully. Any additional external displays I try to plug in do not work or are not recognized by the system.
Here are the details of my setup:
Mac Model: 16-inch MacBook Pro (Apple M4 Pro, 24 GB Memory)
macOS Version: macOS 27 Version 27.0 Beta (Build 26A5353q)
Displays: Two LG UltraFine 5K Thunderbolt displays
Connection Type: Connected directly using two separate Apple Thunderbolt 4 cables
Troubleshooting steps already taken:
-
Restarted the Mac
-
Tested different cables and ports
-
Verified both displays work individually (only fails when both are connected)
Has anyone else encountered this issue on this specific beta build? If so, have you found any temporary workarounds?
Side note: Feedback Assistant was not working for me. I tried it in the Web, and the native App, neither of them would work. I am posting here because there was nowhere else to submit this bug report.
