Fixing VRAM Issue (7MB) for UHD 620 on Sonoma Hackintosh Laptop

Guide:

If you're facing a VRAM issue where the UHD 620 iGPU is stuck at 7MB on your Sonoma Hackintosh laptop, follow these steps to resolve the problem:

1. Update Lilu and WhateverGreen Kexts:

• Ensure that you have the latest versions of Lilu.kext and WhateverGreen.kext installed in your EFI partition. These kexts are essential for graphics acceleration and compatibility with Intel iGPUs.

2. Configure Device Properties:

• Open your config.plist file using a plist editor (e.g., ProperTree, Xcode) and navigate to the DeviceProperties section.
• Add the following properties under the PciRoot(0x0)/Pci(0x2,0x0) device path:

  Copy code
  framebuffer-con1-enable | Data | 01000000
  framebuffer-con2-enable | Data | 01000000
  framebuffer-patch-enable | Data | 01000000
  framebuffer-con1-busid | Data | 02000000
  framebuffer-con1-flags | Data | 00000000
  framebuffer-con2-busid | Data | 04000000
  framebuffer-con2-flags | Data | 00000000
  

• Save the changes to your config.plist file and reboot your laptop.

3. Verify BIOS/UEFI Settings:

• Access your laptop's BIOS/UEFI settings and ensure that any options related to DVMT (Dynamic Video Memory Technology) are configured appropriately.
• Look for settings related to "DVMT Pre-Allocated" or "DVMT Total Gfx Mem" and set them to a value that allocates sufficient memory for the iGPU.

4. Check for ACPI Patches:

• Ensure that you have any necessary ACPI patches applied to your DSDT/SSDTs to enable graphics acceleration and fix related issues.
• ACPI patches can be added using tools like SSDTTime or MaciASL. Refer to Hackintosh forums and resources for recommended patches for your specific laptop model.

5. Test Different Device Paths:

• Experiment with different device paths in your config.plist file, such as PciRoot(0x0)/Pci(0x1b,0x0) or other variations, to see if it resolves the VRAM issue.
• Sometimes, different device paths may provide better compatibility or functionality for the iGPU.

By following these steps and configuring the device properties correctly in your config.plist file, you should be able to resolve the VRAM issue and achieve proper graphics acceleration for the UHD 620 iGPU on your Sonoma Hackintosh laptop.