вот что у меня при подключении, к примеру, K1EL ключа (там тоже FT232RL):
rt5d@rt5d ~ $ lsusb
Bus 002 Device 003: ID 04f2:b029 Chicony Electronics Co., Ltd 1.3M UVC Webcam
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 003: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
Bus 007 Device 002: ID 046d:c52f Logitech, Inc. Unifying Receiver
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 003: ID 08ff:1600 AuthenTec, Inc. AES1600
Bus 005 Device 002: ID 0b05:1751 ASUSTek Computer, Inc. BT-253 Bluetooth Adapter
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
rt5d@rt5d ~ $ dmesg |grep ttyUSB
[ 7420.293209] usb 7-2: FTDI USB Serial Device converter now attached to ttyUSB0
Устройство нормально функционирует