Apple Logo Then Black Screen - Monterey Install - GA-H270N-WIFI - Kaby Lake

[EddyMac]

Removing the "framebuffer" entries highlighted below makes ZERO difference. Having those there neither helps nor hinders. Looks like I've hit a brick wall here. Thanks in advance if you can shed any light. Should I be posting about this in the Post Installation>Graphics section?

 

[EddyMac]

I wanted to report here for future strugglers that I have now fixed this. I have 1536 MB of VRAM and the monitor is recognized.

Two things:

1. Remove device-id property completely.
2. Add boot argument: igfxagdc=0

Also, none of the framebuffer properties seem to make a difference so I removed them.

 

[EddyMac]

Not so fast...

Whenever the system sleeps, I can't get the monitor to wake up and end up having to reboot. Anyone know a fix for this?

 

[Middleman]

Not so fast...

Whenever the system sleeps, I can't get the monitor to wake up and end up having to reboot. Anyone know a fix for this?

Yes indeed. Check out the Dortania guide on Fixing Sleep under Github and look under the part where you have to input some pmset commands into Terminal. > https://dortania.github.io/OpenCore-Post-Install/universal/sleep.html

 

[EddyMac]

Yes indeed. Check out the Dortania guide on Fixing Sleep under Github and look under the part where you have to input some pmset commands into Terminal. > https://dortania.github.io/OpenCore-Post-Install/universal/sleep.html

So basically disable any kind of sleep using Terminal...and we're done?

 

[Middleman]

So basically disable any kind of sleep using Terminal...and we're done?

Yes pretty much. Unless there's something else that could trip it up like a bad USB map or other.