Getting a FTDI USB-to-Serial converter to work on Ubuntu 9.10

I bought a USB-to-Serial converter from and test it with Ubuntu 9.10 (Karmic kernel 2.6.31-18-generic.) I’ve found that it doesn’t show as /dev/ttyUSB0 as other generic USB-to-Serial converter do.

I’ve been googling for the solution for a while and found this bug report: ftdi serial driver broken in linux-image-2.6.31-14-generic (2.6.31-14.48)
It said that the fix is released with linux-kernel 2.6.32-13.18.

So I download a new 2.6.32 kernel package (.deb) from Ubuntu’s kernel-ppa. I installed these package with a command:

sudo dpkg -i *.deb

Now, I can load a ftdi_sio (FTDI Serial Input/Output) driver with a modprobe command. But it doesn’t recognize my device yet. I ran a lsusb command and found that my converter has a different Product ID. (It might be customized by

$ lsusb
Bus 005 Device 005: ID 0403:e2e6 Future Technology Devices International, Ltd

(0403 = vendor ID, e2e6 = product ID)

To get it work, I have to run the following command:

$ sudo modprobe ftdi_sio vendor=0x0403 product=0xe2e6

Then I replug the converter and it is shown as /dev/ttyUSB0 now!


10 ความเห็นบน “Getting a FTDI USB-to-Serial converter to work on Ubuntu 9.10

    1. Currently, I use Ubuntu 10.04, and think that the bug that I mentioned
      in the blog has been fixed.

      I think that your device is a “multi-state” USB devices that need some
      command from the OS to change its state and start working.
      I faced the same problem you’ve said (with my 3G USB modem). But after I
      installed the package “usb-modeswitch”, the problems were gone.

      sudo apt-get install usb-modeswitch

      I don’t know if this is the right fix but please see: for
      more info.

      1. I will check it, but it can be something different. I have EvB 4.3 board (AVR) with built-in USB-Serial converter with FTDI chip. Many people have problem with FTDI on Linux and say, that its driver is broken. I tried Arduino to program this board, but it doesn’t work. Today I run it on Windows (with Arduino), and have the same problem 🙂 Works only with default loader on Windows…

        I don’t speak Thai language, but it must be good blog (I love Linux and programming). I’m student too. Do You recommend visit Thailand?

  1. dmesg:

    usb 6-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
    usb 6-1: Product: ET-USB/RS232 MINI
    usb 6-1: Manufacturer: ETT
    usb 6-1: SerialNumber: ETT1B5HD


    modprobe ftdisio
    echo “0403 e2e6” > /sys/bus/usb-serial/drivers/ftdisio/new_id

    ftdi_sio 6-1:1.0: FTDI USB Serial Device converter detected
    usb 6-1: Detected FT232RL
    usb 6-1: FTDI USB Serial Device converter now attached to ttyUSB0


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