MacBook Pro HDMI fails EDID enumeration post-Monterey; display detected but Vendor/Product IDs missing in SPDisplaysDataType, output black

[hstriepe]

I have tested this on my M4 MacBook Pro and an M1 MacBook Pro.
On MacBook Pro systems running post-Monterey macOS (Sequoia / Tahoe), HDMI-connected displays may be detected as “online” with resolution shown, but EDID enumeration fails. Vendor ID and Product ID are not populated, display overrides do not apply, and most modes produce a black screen despite the monitor sensing signal.

This issue does not occur:
• On the same display/cable using a Mac mini Pro
• On the same MacBook Pro hardware when running macOS Monterey
This appears to be a regression in the laptop HDMI display path after Monterey.

My display, an Odyssey G75F, works well on an M4 Mac mini Pro. Using the same cable, the screen is active, but black. Display panel shows the monitor, but with the wrong resolutions. Retrieving and overriding EDID is ignored. I have tried both BetterDisplay and creating an override /Library/Displays/Contents/Resources/Overrides/DisplayVendorID-4c2d. EDIDs are simply ignored and not processed.

system_profiler SPDisplaysDataType results in:
• Display appears “online” with name and resolution
• Vendor ID and Product ID are missing
• IODisplayEDID is not present in IORegistry
• Display overrides are ignored
• Many resolutions result in a black screen (monitor senses signal)
It is odd, since Displays shows the Vendor and Product.

Setting the monitor to HDMI 1.4 fallback works, but produces a low-quality image.

I have old versions of macOS on my M1 MacBook Pro for development and testing. Monterey works as expected. All others after it fail.

My workaround is a Cable Matters 48Gbps Unidirectional USB-C to HDMI 2.1 Adapter for macOS.
With it, I can force the required resolutions, and they work afterward. But I would sure like to use the factory HDMI I paid for.

Has anybody found a workaround, perhaps with BetterDisplay?

Cheers,
-- Harald

[waydabber]

Hmm. You say "My display, an Odyssey G75F, works well on an M4 Mac mini Pro" - but then that it has no image, which cannot be described as "works well". Are we talking about a different (third) Mac in the second part of the issue description, besides the M4 mini and the M1 MBP you mention?

[hstriepe]

Sorry for the phrasing. I use the Odyssey on my Mac mini Pro without issues. It also works well with MacBooks running Monterey. It is broken on MacBooks running later versions of macOS. My M1 MacBook Pro has all versions of macOS since Monterey for testing.