Hardware⏱️ 3 min read

How to Fix: Problem with Kernel DMA protection for WIN 11 and a ROG STRIX Z390-E GAMING

Troubleshoot kernel DMA protection issues on WIN 11 with ROG STRIX Z390-E GAMING motherboard, enabling secure boot and Intel VT-D settings.

Kernel DMA protection is a feature that prevents unauthorized access to the kernel's direct memory access (DMA) capabilities. In the context of Windows 11 and the ROG STRIX Z390-E GAMING motherboard, this issue can occur due to various reasons.

⚠️ Common Causes

  • Outdated BIOS version: Ensure that the motherboard's BIOS is up-to-date, as an outdated version may not support kernel DMA protection.
  • Incorrect or missing settings: Verify that the necessary settings, such as Intel Virtualization Technology (VTx) and Intel VT-D, are enabled in the BIOS. Additionally, ensure that the 'C' setting is correctly configured.
  • Conflicting drivers or software: Certain drivers or software may interfere with kernel DMA protection. Check for any recently installed drivers or software that might be causing this issue.

🛠️ Step-by-Step Verified Fixes

Method 1: Enable 'C' Setting in BIOS

  1. Step 1: Restart the computer and enter the BIOS settings. Navigate to the Advanced Tab or the Chipset Configuration section.
  2. Step 2: Look for the 'C' setting, which is usually labeled as 'Clear Cache' or 'Clear Level 3 Cache'. Enable this setting by moving the slider or pressing the corresponding key (usually F9 or F10).

Method 2: Update BIOS to Latest Version

  1. Step 1: Download the latest BIOS update from the motherboard manufacturer's website.
  2. Step 2: Create a bootable USB drive with the updated BIOS file and boot from it. Follow the on-screen instructions to update the BIOS.

💡 Conclusion

To resolve kernel DMA protection issues in Windows 11 on the ROG STRIX Z390-E GAMING motherboard, ensure that the 'C' setting is correctly configured and enable Intel Virtualization Technology (VTx) and Intel VT-D. If updating the BIOS is necessary, follow the manufacturer's instructions to update to the latest version.

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