3.11.10-200.fc19.x86_64 the modem-manager takes place and keep restarting my avr-cdc.
I ended up stuck unable to upload any sketch to my arduino.
Ok, i will do it my way. Simply rename the modem-manager in /usr/sbin/modem-manager
to modem-manager-removed and kill the process. Ahah! It never restart anymore since
the kernel could not find the modem-manager application anymore.
Playing with my arduino with no problem :D