How to Fix Haswell GA-Z97MX-Gaming-5 Shutdown & Sleep Issues

By Big Sur
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How to Fix Haswell GA-Z97MX-Gaming-5 Shutdown & Sleep Issues

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. Verify your network controller model (Intel, Broadcom, Realtek).
  2. Ensure the correct kext (e.g., AirportItlwm or BrcmPatchRAM) is loaded in your config.
  3. Clear network interfaces and reset NVRAM if changes don't apply.

Verification

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

Original Question:

Hi,
I have installed Big Sur 11.2.3 on a i7-4790K in a GA-Z97MX-Gaming-5 with a Fenvi-T919 (connected to an internal USB header to enable bluetooth) using OpenCore 0.7.9.

All works as it should, however I am getting sleep (instant wake from sleep) and shutdown (automatic restart after shutdown) issues.

As I am still running 11.2.3, I have built a custom USB KeyMap GA-Z97MX-Gaming-5-USB.kext with the internal USB header set as type 255, however sleep and shutdown still doesn't work...

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Author: milmber

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