root@cccam:~# lsusb
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 004: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 003: ID 04fc:0538 Sunplus Technology Co., Ltd Wireless Optical Mouse 2.4G [Bright]
Bus 003 Device 002: ID 1c4f:0002 SiGma Micro
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 005: ID 05e3:0727 Genesys Logic, Inc.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
root@cccam:~# dmesg | grep tty
[ 0.000000] console [tty0] enabled
[ 5.843797] ftdi_sio ttyUSB0: Unable to read latency timer: -32
[ 5.844131] usb 4-1: FTDI USB Serial Device converter now attached to ttyUSB0
[ 60.912340] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[ 65.167046] ftdi_sio ttyUSB0: Unable to read latency timer: -32
[ 65.167164] usb 4-2: FTDI USB Serial Device converter now attached to ttyUSB0
[ 377.376342] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[ 377.437556] [<c1190262>] ? tty_ioctl+0x71d/0x8b1
[ 377.437626] [<c118fb45>] ? tty_ioctl+0x0/0x8b1
[ 377.437685] [<c118f6fd>] ? tty_write+0x0/0x1c0
[ 377.437771] usb-serial ttyUSB0: ftdi_break_ctl FAILED to enable/disable break state (state was 0)
[ 382.403051] ftdi_sio ttyUSB0: Unable to read latency timer: -32
[ 382.403169] usb 4-1: FTDI USB Serial Device converter now attached to ttyUSB0