Cannot "vmc usb-attach" on Lenovo Chromebook Plus

[Adriano Di Luzio]

Hi ChromeOS devs!

I recently got a Lenovo Chromebook Plus. It is currently running: Version 138.0.7204.163 (Official Build) (64-bit).

On a previous Chromebook, I was able to attach USB devices to `termina` and then to containers using `vmc usb-attach`. On the new device, that does't work. 

Unfortunately, this completely breaks my workflow for this laptop: I used `usb-attach` to enable the use of a Yubikey within Crostini.

If useful, I can help debug / provide more information. Any help? 

Below are the relevant logs:

```

crosh> vmc usb-attach termina 2:19
Error: operation `usb_attach` failed: failed to request OpenPath /dev/bus/usb/002/019
ERROR - ERROR: command failed

```

```

2025-07-27T01:17:15.225959Z INFO permission_broker[2100]: Found claimed interface with driver: usbhid
2025-07-27T01:17:15.228623Z INFO permission_broker[2100]: Found claimed interface with driver: usbhid
2025-07-27T01:17:15.229316Z INFO permission_broker[2100]:   AllowConformingUsbDeviceRule: ALLOW_WITH_LOCKDOWN
2025-07-27T01:17:15.229404Z INFO permission_broker[2100]: Verdict for /dev/bus/usb/002/019: ALLOW_WITH_LOCKDOWN
2025-07-27T01:17:31.991233Z INFO permission_broker[2100]: ProcessPath(/dev/bus/usb/002/019)
2025-07-27T01:17:31.991814Z WARNING permission_broker[2100]: CROS_USB_LOCATION had a value but was not enough to determine permissibility, falling back to legacy logic.
2025-07-27T01:17:31.994864Z INFO permission_broker[2100]: Found claimed interface with driver: usbhid
2025-07-27T01:17:31.996540Z INFO permission_broker[2100]: Found claimed interface with driver: usbhid
2025-07-27T01:17:31.996695Z INFO permission_broker[2100]: Found claimed interface with driver: usbfs
2025-07-27T01:17:31.997137Z INFO permission_broker[2100]:   AllowConformingUsbDeviceRule: DENY
2025-07-27T01:17:31.997175Z INFO permission_broker[2100]: Verdict for /dev/bus/usb/002/019: DENY
2025-07-27T01:17:31.997214Z ERR permission_broker[2100]: OpenPathImpl(...): Domain=permission_broker, Code=permission_denied, Message=Permission to open '/dev/bus/usb/002/019' denied
2025-07-27T01:17:31.997843Z ERR crosh[92637]: ERROR: command failed

```

Checking on another, older Chromebook, the above permission broker returned `ALLOW_WITH_DETACH`.

Best,

A

[Adriano Di Luzio]

For anyone bumping into this as well: I _think_ that the Smart Card Connector app was holding a lock on the device. Disabling it made the `usb-attach` command work. 

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