Please file another bug on this, then post the bug number back here. In terms of data collection for the bug, all you really need to do is reproduce the issue a few times, then capture a sysdiagnose. Done! Bug Number FB25242110 this information is in the bug report, but: The monitors im testing with are a pair of Asus xg27ugc, a 4k, 165hz panel that supports hdmi, DisplayPort, and usbc physical interfaces.

Hey Kevin I just wanted to provide a followup here, I'm on 27.0.1 and I still cant bring up both of my external displays at once without an edid emulator capping the one on the hdmi port to 4k 120. Is there a sysdiagnose I could capture or some other debug info I could get to you?

I just ran into this issue and I'm glad you've been responding @DTS Engineer Just filed my own bug report FB22844211 because my brand new Asus monitors (which i purchased after running into the duplicate EDID issue with dual also-brand-new KTC M27P6 monitors) are only allowing one to be detected. Model XG27UCG from asus. Really, really hoping that this gets addressed. I have absolutely loved my M4 Pro Macbook Pro (first mac i've ever owned) as a software engineer.