On Sun, May 27, 2012 at 5:28 PM, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
There is a procedure for identifying some serial devices via magic PnP
sequences and it ought to be able to identify some modems that way. You
can't however randomly assume.

Maybe this explains why I'm unable to access the serial port... once again SELinux more a pain in the ass rather than of real use...

http://www.ukraa.com/www/faq/75-starbar/102-fedora15rxtx.html

Fedora 15 Unable to connect to serial port

Fedora 15 fails to connect to USB - Serial port or inbuilt serial port

Fedora 15 comes with a restrictive user policy.

Your user account need to be in the dialout group you can accomplish this with the command below run as the root user.

usermod -a -G dialout <username>

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FC