How to Fix Problem dual booting under Opencore when using Hdmi out
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
- Check if your GPU requires WhateverGreen or specific boot-args (e.g., agdpmod=pikera).
- Ensure Metal acceleration is fully supported for your macOS version.
- Update Lilu and WhateverGreen to the latest versions.
Verification
- Reboot and verify if the functionality is restored and stable under typical usage.
Original Question:
Hello,
I've come across a strange issue... I successfully installed Big Sur on u Gigabyte Brix Pro 4570R using Opencore and EFI from sash11 (https://github.com/sash11/Gigabyte-BXi5-4570R). I instaled Windows on a separate SSD and got them to dual boot under OC as well. However, when I switch video output to HDMI on a TV, it will refuse to boot into Windows and instead will start doing the "Preparing Automatic Repair" boot loop. Booting into MacOS is fine. If I change the Bios boot order to go to Windows first (bypassing OC), it boots into Windows without problem. The kicker is that if I switch the video to HDMI on a monitor (instead of a TV) , it will boot into Windows just fine, no issues at all. Any thoughts? Thanks!!!
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