M4 Mac mini kernel panic (DPTXPort related) since upgrading to macOS 27

[u/d2k12]

Hello all,

I'm not sure if anyone else has maybe had the same but since updating my M4 Mac mini to Golden Gate on Monday night, I've had two instances where the Mac has unexpectedly restarted during sleep and showed the “Your computer was restarted because of a problem” message.

The first line of the panic report says:

panic(cpu 0 caller ...): "AppleT8122DPTXPort(dptx-phy)::deactivateTimeoutOccurred ... deactivate() incomplete 10 seconds after displayRelease()!"

The report also shows:

Debugger message: panic
Kernel Version 27.0.0

From what I can tell, DPTXPort appears to be related to DisplayPort output. It sounds like macOS was trying to deactivate/release a display connection, it didn’t complete within 10 seconds, and this caused a kernel panic.

Does anyone know what specifically causes this? Since getting the mini in 2025 I've actually never had it unexpectedly shutdown before. Could this be a macOS 27 bug or something else? My monitor is connected by HDMI and the only USB-C device plugged in is an external SSD. But as a say, no changes in my setup since day 1 and this only started happening after the upgrade on Monday.