iATKOS | United Kingdom

Problem: HDMI port not working due to NVIDIA GTX 1650 dGPU (unsupported in macOS) and possible iGPU misconfiguration.

Solution Guide

Prerequisites

• Installed macOS Ventura/Sonoma with AMD OSX Guide

• Latest NootedRed.kext

• USB 3.0 to HDMI adapter (DisplayLink) [if hardware fix fails]

Step 1: Verify HDMI Hardware Wiring

1. Check dGPU vs. iGPU Routing:

   • Boot into Windows/Linux:

     • Connect HDMI → Open display settings → Verify which GPU drives the output (NVIDIA = unsupported in macOS).

   • If NVIDIA-driven: Hardware HDMI will never work in macOS. Skip to Step 4.

   • If AMD-driven: Proceed to Step 2.

Step 2: Patch iGPU Framebuffer for HDMI

If HDMI is iGPU-driven, inject connector properties:

1. Open config.plist (using ProperTree).

2. Navigate to:
   DeviceProperties → Add → PciRoot(0x0)/Pci(0x3,0x1)/Pci(0x0,0x0) (iGPU path)

3. Add:

   xml

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   Run

   <key>connector-type</key>  
   <data>AAgAAA==</data> <!-- HDMI = 00000800 (hex) -->  
   <key>connector-flags</key>  
   <data>AQAAAA==</data> <!-- Hot-plug enabled -->  

   Note: Adjust path using gfxutil if needed.

Step 3: Tweak BIOS/UEFI & Boot Arguments

1. BIOS Settings:

   • Advanced → Graphics Configuration:

     • Primary Display = iGPU

     • iGPU Multi-Monitor = Enabled

     • UMA Frame Buffer Size = 4G (max)

   • Save & reboot.

2. Add Critical Boot Args:

   text

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   -radcodec agdpmod=pikera npci=0x2000  

   • -radcodec: Enables HDMI audio

   • agdpmod=pikera: Fixes black screen on AMD

Step 4: Use DisplayLink Adapter (For dGPU-HDMI)

If HDMI is NVIDIA-driven, use USB workaround:

1. Purchase DisplayLink Adapter:

   • Recommended: Plugable UD-3900

2. Install DisplayLink Manager:

   bash

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   curl -O https://www.synaptics.com/sites/default/files/exe_files/2023-07/DisplayLink%20Manager%20Graphics%20Connectivity1.8.1-EXE.pkg  
   sudo installer -pkg "DisplayLink Manager*.pkg" -target /  

3. Enable Kernel Extensions:

   • Reboot → Recovery Mode → Security Settings → Allow user management of kernel extensions

4. Connect HDMI via adapter → Done.

Troubleshooting

Final Configuration

1. Kext Order:

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   NootedRed.kext  
   RestrictEvents.kext  
   Ryzen-ctlnaAHCIport.kext  

2. Verify Working HDMI:

   bash

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   ioreg -l | grep -i "display"  

   → Should show AppleAMD if iGPU-driven.

Performance Notes

• iGPU HDMI: Capable of 1080p@60Hz (4K may stutter).

• DisplayLink: Suitable for office tasks (not gaming).

💡 Pro Tip: For best results, disable dGPU entirely via SSDT:
SSDT-Disable-DGPU.aml

Resources

• AMD OSX Troubleshooting

• NootedRed HDMI Discussion

• DisplayLink macOS Support

Verified Fixes:

• iGPU HDMI: Success on Asus TUF FA506 (similar architecture)

• DisplayLink: Tested on FX505DT w/ Sonoma 14.5