How to Fix ThunderboltEX II + Big Sur: Not working

How to Fix ThunderboltEX II + Big Sur: Not working

This mini-guide provides a structural approach to troubleshoot and fix the issue.

Prerequisites

• Confirm your hardware specifications (CPU, GPU, Motherboard).
• Ensure you have a bootable recovery USB and backup your EFI.

Fix Steps

1. Check if your GPU requires WhateverGreen or specific boot-args (e.g., agdpmod=pikera).
2. Ensure Metal acceleration is fully supported for your macOS version.
3. Update Lilu and WhateverGreen to the latest versions.

Verification

• Reboot and verify if the functionality is restored and stable under typical usage.

Original Question:

I managed to get Big Sur on my x99 Rog Strix + i7-6900k + AMD Rx480.
However, the ThunderboltEX 2 card (which worked on high Sierra on same computer) does not seem to work.

Anyone got this working on Big Sur?
Is this possibly a kext issue?

Any help appreciated

MD

Author: mightydood2