Hi Steven, On Sun, 20 Mar 2011 20:49:35 +0800 you wrote: > > If someone could point me in the right direction it would be much > appreciated. > Well, I don't know whether this is the right direction, but... > Mar 19 18:20:30 stomp kernel: drivers/usb/serial/ftdi_sio.c: > ftdi_set_termios Turning off hardware flow control > Mar 19 18:20:30 stomp kernel: drivers/usb/serial/ftdi_sio.c: > update_mctrl - DTR LOW, RTS LOW There was a change to ftdi_sio at 2.6.36 that erroneously set the wrong hardware flow control state when flow control is turned off. It's been fixed since, but I don't know whether that was included in the first 2.6.38 or whether it was patched later. I did a nasty kludge of calling ioctl ( SerHnd, TIOCMBIS, &value ); as a work-around when I ran up against this. Cheers, Rob -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html