[Bug 220331] New: FTDI serial IO - unknown device type: 0x8312

bugzilla-daemon
2025-07-10T09:11:14Z

Bug ID: 220331
Summary: FTDI serial IO - unknown device type: 0x8312
Product: Drivers
Version: 2.5
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: USB
Assignee: drivers_usb@kernel-bugs.kernel.org
Reporter: tomas.hanslik@septim.cz
Regression: No

Issue with a newer hardware with USB DisplayLink adapter, syslog throws
following error about unrecognized device type 0x8312:

> [ 4.447826] usb 1-8.2.1: New USB device found, idVendor=17e9,
> idProduct=ff00, bbcdDevice=83.12
> [ 4.447833] usb 1-8.2.1: New USB device strings: Mfr=1, Product=2,
> SerialNumber
> =3
> [ 4.447835] usb 1-8.2.1: Product: PM1000
> [ 4.447836] usb 1-8.2.1: Manufacturer: DisplayLink
> [ 4.447837] usb 1-8.2.1: SerialNumber: 9638293100007141
> [ 4.479297] usbcore: registered new interface driver ftdi_sio
> [ 4.479363] usbserial: USB Serial support registered for FTDI USB Serial
> Device
> [ 4.480786] ftdi_sio 1-8.2.1:1.0: FTDI USB Serial Device converter
> detected
> [ 4.480848] ftdi_sio ttyUSB0: unknown device type: 0x8312
> [ 4.480923] ftdi_sio 1-8.2.1:1.1: FTDI USB Serial Device converter
> detected
> [ 4.480957] ftdi_sio ttyUSB1: unknown device type: 0x8312
> [ 4.486014] ftdi_sio ttyUSB0: unknown device type: 0x8312
> [ 4.486049] ftdi_sio ttyUSB1: unknown device type: 0x8312