[Detector Support]: Coral USB TPU not detected after upgrading to Frigate 0.16.1 (worked in 0.16.0)

[tytoalba99]

Describe the problem you are having

After upgrading from Frigate 0.16.0 to 0.16.1, my Coral USB TPU is no longer detected. It was working without any issues on version 0.16.0.

I'm running Home Assistant in a VM on a Proxmox server. The Coral USB device is correctly passed through to the VM and recognized at the system level. The issue only started after updating to 0.16.1.

When I downgrade back to Frigate 0.16.0, the Coral USB TPU is detected again and works properly. This confirms that the issue is introduced in 0.16.1.

Version

5.9.4/0.16.0-c2f8de9

Frigate config file

detectors:
  coral:
    type: edgetpu
    device: usb

docker-compose file or Docker CLI command

N/A

Relevant Frigate log output

[2025-09-09 17:19:11] frigate.detectors.plugins.edgetpu_tfl ERROR   : No EdgeTPU was detected. If you do not have a Coral device yet, you must configure CPU detectors.
Process detector:coral:
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/dist-packages/tflite_runtime/interpreter.py", line 166, in load_delegate
    delegate = Delegate(library, options)
  File "/usr/local/lib/python3.11/dist-packages/tflite_runtime/interpreter.py", line 104, in __init__
    raise ValueError(capture.message)
ValueError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/opt/frigate/frigate/util/process.py", line 41, in run_wrapper
    return run(*args, **kwargs)
  File "/usr/lib/python3.11/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/opt/frigate/frigate/object_detection/base.py", line 112, in run_detector
    object_detector = LocalObjectDetector(detector_config=detector_config)
  File "/opt/frigate/frigate/object_detection/base.py", line 57, in __init__
    self.detect_api = create_detector(detector_config)
  File "/opt/frigate/frigate/detectors/__init__.py", line 18, in create_detector
    return api(detector_config)
  File "/opt/frigate/frigate/detectors/plugins/edgetpu_tfl.py", line 42, in __init__
    edge_tpu_delegate = load_delegate("libedgetpu.so.1.0", device_config)
  File "/usr/local/lib/python3.11/dist-packages/tflite_runtime/interpreter.py", line 168, in load_delegate
    raise ValueError('Failed to load delegate from libedgetpu.so.1.0\n{}'
ValueError: Failed to load delegate from libedgetpu.so.1.0

Install method

Home Assistant Add-on

Object Detector

Coral

Screenshots of the Frigate UI's System metrics pages

N/A

Any other information that may be helpful

No response

[inkeep-ai-assistant[bot]]

I don't have specific information about changes between Frigate 0.16.0 and 0.16.1 that would affect Coral USB TPU detection in the available documentation. However, I can help you troubleshoot this issue based on the error you're seeing.

The error "Failed to load delegate from libedgetpu.so.1.0" and "No EdgeTPU was detected" are common Coral USB detection issues (1). Here are the most likely causes:

Power Issues

The USB Coral can draw up to 900mA, which may be too much for some USB ports (1). Try these steps:

• Use a different USB port, preferably USB3 for better power delivery (1)
• Try a different USB cable - some users have found the included cable problematic (1)
• Use an externally powered USB hub (1)

Device Access in VMs

When running Frigate in a VM on Proxmox, you must ensure both device IDs are mapped (1). The USB Coral has different IDs when uninitialized (1a6e:089a Global Unichip Corp.) and initialized (18d1:9302 Google Inc.) (1).

Home Assistant Add-on Configuration

Since you're using the Home Assistant Add-on, you may need to run the Full Access variant with Protection mode disabled so the Coral can be accessed properly (1).

Your configuration looks correct:

detectors:
  coral:
    type: edgetpu
    device: usb

(2)

Since downgrading to 0.16.0 resolves the issue, there may have been changes in how the EdgeTPU library is loaded in 0.16.1. You might want to check if there are any updates to the Home Assistant Add-on or try restarting your Proxmox host while keeping the TPU plugged in (1).

📚 Sources:

1. Troubleshooting EdgeTPU
2. Supported Hardware

---

Have another question? Just tag @inkeep.

[NickM-27]

See the FAQ, Upgrade Question 3 #18048

[hipitihop]

Just a data point: I run Frigate via docker compose on a Ubuntu host with the Coral USB TPU and I have not seen issue with it between 0.15.2 , 0.16.0 and now on 0.16.1