FULL AI ANALYSIS

Final Cut Pro export stalls at 0% when eGPU connected and discrete GPU offload active on macOS 14.1

Generated Oct 3, 2026, 12:35:03 AM

Analysis summary

The problem reproduces only when the eGPU is active and Final Cut Pro attempts to use the external GPU for encoding/rendering. Console logs indicate stalls in the Metal/IOAccel stack and device offline messages, which points toward a driver or Thunderbolt connectivity issue that leaves FCP waiting on GPU work that never completes. Because disabling eGPU forces FCP to use the integrated GPU and exports succeed, the application pipeline is intact. Suspect causes are eGPU driver/Metal regression, Thunderbolt dock firmware resetting the device under load, or Final Cut Pro not handling device resets gracefully.

Possible causes

Metal or GPU driver regression on macOS 14.1 that mismanages offloaded render jobs on external GPUs.

75%

Throttled/unreliable Thunderbolt connection or dock firmware causing the eGPU device to go offline during job initialization.

60%

Final Cut Pro not handling a specific external GPU vendor's feature set, leading to hangs when presented as the primary device.

30%

Power or thermal constraints on the eGPU enclosure leading to device resets when large workloads begin.

20%

Suggested fixes

Diagnostic step 1

Reproduce and collect: with eGPU connected, reproduce hang and capture a sysdiagnose (use Activity Monitor → Sample Process or command-line sysdiagnose) and Console logs filtered for 'GPU', 'Metal', 'IOAccel' and time ranges of the hang for submitting to Apple or the eGPU vendor.

Diagnostic step 2

Test with the eGPU directly connected to the Mac (bypassing the dock) to rule out dock firmware or cable issues. Use a known-good Thunderbolt cable.

Diagnostic step 3

Try a different eGPU enclosure or GPU if available to determine whether the issue is vendor/model-specific.

Diagnostic step 4

Keep 'Prefer external GPU' off as a short-term mitigation and use the internal GPU for Final Cut exports while allowing other supported apps to use the eGPU selectively via per-app settings.

Diagnostic step 5

If logs show clear device offline/reset events at the driver layer, escalate to Apple or GPU/eGPU vendor with collected logs and reproduction steps; do not alter system files. Consider testing on macOS 14.2 beta or rolling back to the previous macOS release in a controlled environment if time-sensitive production work is blocked.

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