USBGuard blocks ipu6 webcam on raptor lake

[ManoftheSea]

Linux kernel 6.11.6, intel iVSC firmware from 20240614, IPU6-camera-bins from 20240927, ipu6ep-camera-hal from 20240929, NixOS 24.11 distribution, Dell Precision 5680 with i7-13800H (Raptor Lake). With USBGuard enabled, the system is never able to detect supported sensor OVTI02C1, and the device at /sys/bus/i2c/devices/i2c-OVTI02C1:00 never appears. No webcam. With USBGuard turned off, the webcam works.

When USBGuard is enabled and all devices are allowed, there does not appear any device in the output of usbguard list-devices | grep block. Still, no webcam, no line in dmesg about detecting the sensor.

Please inform me how to gather any necessary debugging information, I regretfully don't know how the I2C is related to USB to be able to investigate.

[ManoftheSea]

In testing around this issue, it was pointed out that there exist two USB devices on this system: 8086:0b63 "USB Bridge", and 25a4:9411 "USB C Video Adaptor". I believe there is a difference in allowing the USB Bridge device as part of the rules, vs allowing it manually. I cannot find a combination of usbguard allow-device commands that will allow the webcam to work, but when both devices are allowed according to either the default target or the rules.conf file, the webcam will begin to function.

To correct my original report, I believe the USB C Video Adaptor device only appeared in the USB device list on kernel 6.11. I did not recognize that the USB Bridge was related.

Should the webcam be able to function if these devices are enabled "late"?