I have used Arduino Duemilanove succesfully with my own laptop. Today I have tried to use it with two other laptops which both run Fedora 12. Both have problems with the serial port selection (Tools -> Serial Port). Please help!
- MENU TOOLS -> SERIAL PORT IS GRAYED
On the first laptop I can't select the correct serial port because the menu Tools -> Serial Port is grayed. I can't program my Arduino, the TX and RX LEDs are not lit.
- /dev/ttyUSB2 IS MISSING FROM THE MENU
On the second laptop I have a USB 3G (UMTS) modem, which has created /dev/ttyUSB0 and /dev/ttyUSB1. When I plug in my Arduino, device /dev/ttyUSB2 gets created and /var/log/messages contains no errors. However, I can see that both gpsd (gpsd.hotplug) and NetworkManager try to probe /dev/ttyUSB2, but both fail. When I start the Arduino Java application, menu Tools -> Serial Port displays only /dev/ttyUSB0 and /dev/ttyS0 but not /dev/ttyUSB2. Permissions for files /dev/ttyUSB* are identical. There is only one lock file (/var/lock/LCK..ttyUSB0) for the 3G modem.
For both machines I have added myself to group dialout, uucp and lock. In addition to that I have issued command "newgrp dialout" before starting Arduino GUI. The files /dev/ttyUSB* have group dialout.