Plugin probing issues with USB vendor/product ID

[Thomas Sailer]

Hi list,

I experience a plugin vendor/product ID probing issue with an USB device, the Thuraya XT phone. The phone directly plugs into an USB port, there's no USB-RS232 converter in between.

On one computer, it works correctly:
ModemManager[16628]: <debug> [1455370018.138700] [../../src/mm-device.c:457] export_modem(): (/org/freedesktop/ModemManager1/Modem/0): 'Thuraya' modem, VID 0x1A26 PID 0x09CF (usb)

while on two other computers, it looks like:
ModemManager[26067]: <debug> [1455276249.169409] [../../src/mm-device.c:457] export_modem(): (/org/freedesktop/ModemManager1/Modem/0): 'Thuraya' modem, VID 0x8086 PID 0x8C31 (usb)

ModemManager[8423]: <debug> [1455372319.708249] [../../src/mm-device.c:457] export_modem(): (/org/freedesktop/ModemManager1/Modem/0): 'Thuraya' modem, VID 0x8086 PID 0x9C26 (usb)

I.e. on the broken computers, the VID/PID are taken from the PCI IDs from the host controller, instead of the VID/PID of the USB device!

All three computers run up-to-date Fedora 23, all of them are pretty standard Intel hardware.

Can someone familiar with how plugin probing works guide me to debug this problem? Dan, Bjørn?

Thanks,
Thomas