[Dev] Upgrade linux-libre drops support for FTDI USB Serial Device

[Mono]

Ahoi,

after upgrading linux-libre from 3.16.4 to 3.17.1 (32-bit) my FTDI USB Serial Device does not get recognized anymore. Watching journalctl -fk under 3.16.4 while plugging the device in and out yields the following:

usb 2-2: new full-speed USB device number 2 using uhci_hcd
usbcore: registered new interface driver usbserial
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial support registered for generic
usbcore: registered new interface driver ftdi_sio
usbserial: USB Serial support registered for FTDI USB Serial Device
ftdi_sio 2-2:1.0: FTDI USB Serial Device converter detected
usb 2-2: Detected FT232RL
usb 2-2: Number of endpoints 2
usb 2-2: Endpoint 1 MaxPacketSize 64
usb 2-2: Endpoint 2 MaxPacketSize 64
usb 2-2: Setting MaxPacketSize 64
usb 2-2: FTDI USB Serial Device converter now attached to ttyUSB0

usb 2-2: USB disconnect, device number 2
ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
ftdi_sio 2-2:1.0: device disconnected

In the contrary, linux-libre 3.17.1 does not log anything and does not provide me with any /dev/ttyUSB0. Comparing the two config.i686 files did not let me find the cause.

How could I enable this device again?

with best regards
Mono