Why Is Frigate Coral TPU Not Detected After Update?
- Host device mapping changed in container
- Permission/group access lost
- Coral runtime conflict after 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.
Symptoms
- TPU detected before update but missing now
- Object detection stopped after upgrade
- Frigate logs show detector errors
- CPU usage spikes unexpectedly
- No new detections despite active streams
- Restart does not restore TPU
Recognize these? Here's what usually causes it.
Common Causes
- Host device mapping changed in container
- Permission/group access lost
- Coral runtime conflict after update
- USB/PCIe passthrough not mounted
- Competing process using TPU
- Version regression between Frigate and host stack
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
Ensure 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.
- Host device mapping changed in container
- Permission/group access lost
- Coral runtime conflict after update
- USB/PCIe passthrough not mounted
- Competing process using TPU
Before you go — try one of these (they fix most cases).
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.