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- Jul 22, 2018
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- Supermicro X11SPA-T
- CPU
- Intel Xeon W-3275 28 Core
- Graphics
- 2xAMD RX 580 8GB
- OS X/macOS
- 13.x
- Bootloader
- OpenCore (UEFI)
- Mac
- Mac mini
- MacBook Pro
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13700k, z690 gaming x ddr4, rx6750xt, 3x 1080p + 4ktv, getting random freezes for few seconds, mouse is moving, audio is playing, but nothing is clickable, then everything goes back to normal (sometimes colored squares or lines artifacts appear, then it goes away) rx6750xt working fine in other OS windows and linux, my questions: how to solve this freezing issue? a long chat with AI, inspecting tons of logs the conclusion was (screenshot) Q2. is it required to have pre-installed macos? (I can not install the system while nootrx enabled)? i tried installing Tahoe on another machine I5 6600 with WEG and spoofed IGPU then take the installed disk to my main rig but the freezes was even worse
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- Joined
- Jul 22, 2018
- Messages
- 9,129
- Motherboard
- Supermicro X11SPA-T
- CPU
- Intel Xeon W-3275 28 Core
- Graphics
- 2xAMD RX 580 8GB
- OS X/macOS
- 13.x
- Bootloader
- OpenCore (UEFI)
- Mac
- Mac mini
- MacBook Pro
- Mobile Phone
- Android
- iOS
Below is my EFI download link. Thank you in advance.
www.dropbox.com
Everything else works. Wireless AX210 Working with itlwm Intel BT not working, Audio with VodooHDA, I even managed to make a CSR 4.0 BT Adapter work with BlueToolFixup, SAS HBA, etc The freezing issue is the only problem I can see.
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Everything else works. Wireless AX210 Working with itlwm Intel BT not working, Audio with VodooHDA, I even managed to make a CSR 4.0 BT Adapter work with BlueToolFixup, SAS HBA, etc The freezing issue is the only problem I can see.
I think I finally fixed the freezing issue I’ve been suffering from since Sequoia. and please correct me if I’m wrong. (XFX Speedster QICK319 Radeon RX 6750XT 12GB GDDR6)
After a lot of testing and log digging, and some AI-assisted log inspection, it turns out the culprit was Resizable BAR (ReBAR).
Here’s what solved it for me:
Since applying them, the system has been rock-solid — no more random freezes. Let’s hope it stays that way
- BIOS → Resize BAR Support: Disabled
- OpenCore Config → ResizeAppleGpuBars: -1
- OpenCore Config → ResizeGpuBars: -1
From what I’ve seen in the logs, when ReBAR is enabled (either in BIOS or through OpenCore), macOS sees an unexpected BAR size, which leads to incorrect VRAM address mapping or invalid port references. During display reinitialization (the “modeset” event — waking the display, switching resolutions, or triggering a GUI redraw), the AMD driver then tries to access VRAM through this invalid range, causing a kernel stall or freeze.
Disabling ReBAR forces legacy 256 MB BAR segmentation, which macOS’s AMD drivers (especially AGDP and AMDRadeonX6000) expect — and stability is restored.
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