RTX 5060 Ti eGPU (AORUS AI BOX) — CUDA hard-lock on Linux via Thunderbolt 4

[n.ivankin]

Here is the fix:

RTX 5080 eGPU (USB4/Thunderbolt) on Ubuntu 24.04: cuCtxCreate() returns CUDA_ERROR_UNKNOWN or hangs, while nvidia-smi works

God bless OpenAI and ChatGPT Resolved with a reproducible workaround After further testing, I found that the failure is related to the PCIe link between the Thunderbolt enclosure’s downstream bridge and the RTX 5080. The immediate parent bridge of the GPU is: 0000:03:00.0 Intel Thunderbolt 80/120G Bridge Barlow Ridge Hub 80G 2023 PCI ID: 8086:5786 The GPU is: 0000:04:00.0 NVIDIA GeForce RTX 5080 PCI ID: 10de:2c02 By default, the bridge-to-GPU link operated at PCIe Gen4 x4: LnkSta: Speed …