How to Fix The AMD Radeon HD6670 graphics card only has 3MB vram
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:
opencore 0.8.3+mac big sur ,
After installing the system, upon entering, the resolution is 1024x768. I discovered that the graphics card only has 3MB vram ,
I followed an online tutorial, downloaded the SSDT file, made modifications to the ACPI path and ID, compiled it into an AML file, and edited the config.plist using OCAuxiliaryTools to load the AML file. However, after booting into the system, the resolution is still 1024x768 and the video vram at 3MB. Does anyone know why this is...
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After installing the system, upon entering, the resolution is 1024x768. I discovered that the graphics card only has 3MB vram ,
I followed an online tutorial, downloaded the SSDT file, made modifications to the ACPI path and ID, compiled it into an AML file, and edited the config.plist using OCAuxiliaryTools to load the AML file. However, after booting into the system, the resolution is still 1024x768 and the video vram at 3MB. Does anyone know why this is...
Read more
There could be a few reasons why you're experiencing low VRAM and a limited resolution after installing macOS Big Sur with OpenCore. Here are a few troubleshooting steps you can try:
ReplyDelete1. Ensure that your graphics card is properly recognized: Check your config.plist file and make sure you have the correct device properties configured for your graphics card. Verify that the device ID and other relevant information match your specific GPU model.
2. Check your SSDT modifications: Double-check your ACPI path and ID modifications in the SSDT file. Make sure you have followed the correct instructions and applied the changes accurately. Any errors in the SSDT file can prevent the system from properly recognizing the graphics card.
3. Verify that the SSDT is loaded correctly: Confirm that the SSDT file is being loaded properly by OpenCore. Check the `ACPI` section of your config.plist and ensure that the SSDT is added to the `Add` section and that it's being loaded in the correct order.
4. Check for conflicting kexts or configurations: Make sure there are no conflicting kexts or configurations related to graphics in your config.plist or other system files. Conflicting settings can interfere with the proper functioning of the graphics card.
5. Update your OpenCore version and kexts: Ensure that you're using the latest version of OpenCore and that your kexts are up to date. Sometimes, updating to the latest versions can resolve compatibility issues and improve system performance.
6. Check for compatibility with macOS Big Sur: Confirm that your specific graphics card is compatible with macOS Big Sur. Some older or less common GPUs may not have full support or may require additional patches or kexts to work properly.