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FTDI USB-Serial driver is constantly writing message to console:
write request of 0 bytes
The FTDI driver code uses the "err" function which will write the message to standard out.
FTDI source developer recommends that the "err" function be changed to the "dbg" function.
Edit the ftdi_sio.c file (found in /usr/src/[kernel version]/drivers/usb/serial) and modify the following line:
err("write request of 0 bytes");
dbg("write request of 0 bytes");
Note: Bill Ryder - email@example.com - wrote the FTDI_SIO implementation and may modify the driver in a future kernel release.