Why Is Frigate Coral TPU Not Detected After Update?
- Docker device passthrough lost/changed
- udev rules missing after update
- PCIe/M.2 driver (gasket/apex) broken by a kernel update
Problem Description
After updating Frigate or host environment, Coral TPU detection fails and object detection stops. The service may run, but inference does not process. Typical causes include device permission changes, container mapping issues, host driver conflicts, or update-level compatibility shifts.
Why This Happens in Real Homes
A Coral TPU disappearing after a Frigate or host update usually isn't a dead device — it's the passthrough or driver link between the host, Docker, and the Coral that broke. A kernel update commonly breaks the PCIe/M.2 Coral's gasket/apex driver (DKMS needs rebuilding), and Docker or udev changes can break USB Coral passthrough, so Frigate falls back to slow CPU detection.
For a USB Coral, verify the device is passed into the container (the correct /dev/bus/usb path or --device mapping) and that udev rules and permissions are in place; re-plugging it re-enumerates it. For a PCIe/M.2 Coral, reinstall the gasket driver (gasket-dkms) after the kernel update so the apex device reappears, then confirm Frigate's detector config points at the TPU. Restoring the driver or passthrough brings the TPU back.
Symptoms
- Coral TPU not detected after update
- TPU missing post-update
- Falls back to CPU detection
- Coral not found
- Detector error (no TPU)
- TPU device gone
- EdgeTPU not initialized
- No Coral after host update
Recognize these? Here's what usually causes it.
Common Causes
- Docker device passthrough lost/changed
- udev rules missing after update
- PCIe/M.2 driver (gasket/apex) broken by a kernel update
- USB device path changed
- Permissions on the device
- Host driver needs reinstall
- Container config not mapping the device
- Coral firmware/enumeration issue
Most fixes happen in the first 3 steps.
Avoid simultaneous major updates of Frigate, host OS, and container runtime. Layered changes make root-cause isolation much harder.
Tools & Requirements
Step-by-Step Solution
Verify TPU at host level
Before editing Frigate config, confirm Coral device is visible on the host OS and not disconnected. If host cannot see TPU, fix hardware/runtime path first. Frigate troubleshooting inside container will not help until host detection is stable.
Check container mappings and permissions
Review device mount flags and user/group permissions in your deployment configuration. Updates can change runtime behavior, and missing device access produces detector startup failures even with correct Frigate YAML.
Validate detector configuration
Confirm detector type, model path, and accelerator settings match your Coral deployment mode (USB or PCIe). Incorrect detector block or stale model path can make Frigate start without valid inference output.
Eliminate conflicting TPU consumers
Make sure no other application is reserving Coral resources on the host. Competing AI services can make Frigate report detector initialization errors or intermittent disconnect behavior under load.
Regression-test and document
If issue began immediately after update, test rollback to last-known-good version and compare behavior. Capture logs from failing and working states to confirm update regression before opening issue reports.
Quick Solutions
Still having issues? This is usually the deeper cause below.
If the sensor still misses events after repositioning, check whether a scheduled 'home' or 'away' mode is overriding the sensitivity setting silently.
Maintain a tested upgrade path with staged rollout; validate Coral detection on one environment before updating all deployments.
This issue almost always looks more complex than it is — the majority of cases trace back to a single setting, a stale credential, or a default that shipped wrong.
- Docker device passthrough lost/changed
- udev rules missing after update
- PCIe/M.2 driver (gasket/apex) broken by a kernel update
- USB device path changed
- Permissions on the device
Before you go — try one of these (they fix most cases).
Official Manufacturer Manual
Frigate provides official product documentation through their online manual rather than downloadable PDF. Access setup guides, troubleshooting steps, and product specifications for your Frigate Coral TPU Detection.
Source: docs.frigate.video
Need More Help? Frigate Support
Note: The contact information below connects you directly to Frigate's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.
Accessories owners commonly pair with Frigate Coral TPU Detection.
SANDISK 64GB Extreme microSDXC UHS-I Memory Card with Ada...
SANDISK 128GB Ultra microSDXC UHS-I Memory Card with Adap...
SANDISK 64GB Ultra microSDXC UHS-I Memory Card with Adapt...
As an Amazon Associate we earn from qualifying purchases.