Hi,

> 1. Recursively search /sys/devices for "busnum" (which seems to
> indicate a USB device)
Which, IMHO, would suggest devd or udevd to be required, since the
enumeration is done by the daemon.

BTW: I'm not sure, but "busnum" could be used by I2C device drivers, as
well. You (or someone) may want to check, if daemons like sensorsd (CPU
thermal and fan supervision etc.), finger print sensor drivers or
drivers of old touch pads and ThinkPad finger sticks (which often were
connected by I2C) use conflicting bus enumeration. I'd suggest to limit
the search for devices to /sys/bus/usb/devices and
/sys/bus/usb-serial/devices.

Regards, Tiger

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