Dear list, I have an USB Atmel programmer which uses the FTDI driver. It has a VID/PID pair of 0403:FA33. It identifies itself as "TavIR STK500". Here is a photo of the the device: http://avr.tavir.hu/images/contents/809/809l-stk500-m.jpg lsusb output: Bus 002 Device 005: ID 0403:fa33 Future Technology Devices International, Ltd dmesg output with patched kernel: [ 1835.915073] usb 2-1.3: new full speed USB device using ehci_hcd and address 5 [ 1836.012322] usb 2-1.3: New USB device found, idVendor=0403, idProduct=fa33 [ 1836.012329] usb 2-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 1836.012336] usb 2-1.3: Product: TavIR STK500 [ 1836.012340] usb 2-1.3: Manufacturer: TavIR AVR [ 1836.014620] ftdi_sio 2-1.3:1.0: FTDI USB Serial Device converter detected [ 1836.014723] usb 2-1.3: Detected FT232RL [ 1836.014730] usb 2-1.3: Number of endpoints 2 [ 1836.014737] usb 2-1.3: Endpoint 1 MaxPacketSize 64 [ 1836.014743] usb 2-1.3: Endpoint 2 MaxPacketSize 64 [ 1836.014749] usb 2-1.3: Setting MaxPacketSize 64 [ 1836.015394] usb 2-1.3: FTDI USB Serial Device converter now attached to ttyUSB1 Please consider applying this trivial patch which allows the system to recognise the device as a serial io port. I'm not a subscriber of this mailing list, so please CC the answers personally too. Thank you. Regards, Benedek László