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Luckily found the problem on the 4th step. I saw this a few times here while I was searching for probable cause of the issue, but yeah "ResizeGpuBars" should always be -1. Since I was trying to enable it I set both ResizeGpuBars and ResizeAppleGpuBars to 0.

I have a single drive multiboot setup with Sonoma and Windows 11. I can boot just fine into Sonoma via OC, and into Windows using Windows boot manager. However, if I pick Windows in OC, I get black screen. I get the Windows chime, so it technically boots, but I can't do anything. I do have...

Ok, that's good to know. I don't know what I did (mostly re-checked and fixed a lot of BIOS settings) but now that's what I'm getting as well. It's still weird to me that iGPU behaved more native (i.e without black screen at all) although it required a lot more work to get working initially.

Well, having it doesn't resolve the problem.

So originally I've been running Big Sur and Monterey on iGPU, I'd go through verbose, then apple logo with loading bar, then login screen. After adding 6600XT my displays would get "no signal" after verbose, than return right to login screen. Now, I did a clean install of Sonoma using OC 0.9.8...