USB Type-C port does not work — GPU and Display Troubleshooting

By Freirburro
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Graphics issues usually stem from an unsupported GPU, missing acceleration patches, or incorrect boot arguments. Below is a systematic approach to diagnosing and fixing them.

Step 1 — Verify GPU Compatibility

Check if your GPU model is natively supported in your target macOS version. AMD Radeon RX 400/500/5000 series generally work natively. NVIDIA support ended at High Sierra for most cards.

Step 2 — Update Essential Kexts

Ensure Lilu and WhateverGreen are installed and current.

Step 3 — Configure Boot Arguments

Add -v keepsyms=1 debug=0x100 for debugging. For AMD cards add agdpmod=pikera.

Step 4 — Confirm Metal Support

Open About This Mac > System Report > Graphics/Displays. Metal support should be listed.

Expected Results

  • Graphics acceleration is smooth
  • Correct resolution on all displays
  • No GPU-related kernel panics

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Original Question: "USB Type-C port does not work"

My USB Type-C port does not work. I didn‘t map the USB Ports because I don‘t know how to map them. Is that why it's causing the problem?

Thanks in Advance! :)

PC Components:

Gigabyte B360M D3H, Intel Core i5-8400, NVIDIA GeForce GTX 1070 Ti 8GB, 16GB DDR4 2133MHz RAM

Bootloader: OpenCore 0.6.4

macOS Version: macOS High Sierra 10.13.6 (Build 17G14042)

SMBIOS: iMac18,3

submitted by /u/abdusacc
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