However, if your CMR is FT232H product=0x6014 (gingernuts is product=0x8350) it would be good to provide 2 things:
usbmon (or direct access to it via /sys or /proc or /dev or wherever your Linux OS puts it - yes it must be Linux)
output of plugging it in and also running the usbtest.py that comes with cgminer current git like:
./usbtest.py /dev/ttyUSB? icarus (whatever the USB? is)
and make sure it gave the right answers (or rerun it)
and lsusb -v of the device
If it actually creates multiple /dev/ttyUSB? you'll need to run that whole process on each of them (from plug in to usbtest.py)