[NUC8i5BEH] - upgrade to macOS 12.3 RC, boot failed

[Quanuanc]

Please provide the follow information:

• Steps to reproduce the issue -- this is crucial upgrade from 12.2.1 to 12.3 RC, while install success, nuc will reboot, then will stuck in the boot proccess.

• Any changes you made to the config and/or EFI other than serials/etc

  1. add AirportBrcmFixup.kext for bcm943602cs card
  2. delete some kexts: AirportItlwm.kext, BlueToolFixup.kext, IntelBluetoothFirmware.kext
  3. use ProperTree's OC Clean Snapshot (Cmd+Shift+R) to walk the contents of Kexts for OpenCore config.plist files

• Any logs related to the issue if applicable

[zearp]

No such issue on my test machine running macOS 12.3 (21E230). It was upgraded using Software Update.

Disable any additional kexts to rule out any of those cause your boot failure.

If that doesn't work. Try a usb install on top of what you have now using an unmodified version of the EFI. You can disable kexts you don't need but don't add anything until install is complete. Boot with a 12.3 installer and install it on top of your existing one. No data or settings will be lost.

Unfortunately the log isn't helping, there's no crash showing or anything jumping out that gives the reason why it's stalling. It is stalling there right? Or do you get a boot-loop?

[zearp]

The last messages in your log relate to AirportBrcmFixup.kext -- if it's the cause then it may not be ready for 12.3 yet.

[Quanuanc]

I found a way to pass it, but it's strange. When my nuc starts up, if 4K resolution screen is connected at this time, it will get stuck. But when i use a 2K resolution screen at startup, it can start up normally. Both of them are connected by thunderbolt interface.

[zearp]

I'm happy you fixed it. It is very weird indeed. I can't test it because I don't have any Thunderbolt screens.

[Quanuanc]

Just update some information.

If someone has a problem like me (unable to boot successfully in a 4K screen, but can boot successfully in a lower resolution screen), you can add igfxagdc=0 boot argument to boot-args in opencore's config.plist.

I don't know what it does, but it does work for me.

[zearp]

It toggles AGDC, it is enabled by default. Very interesting find. Seems to be causing issues with certain 4k screens for a while now. I'm not sure if we need AGDC enabled, will do some tests when I have more time for it and turn it off by default if its not needed. Thanks!

[Quanuanc]

Thanks for your work.

[vardumper]

I agree with @Quanuanc. Your work is appreciated Mr. zearp!