[ubuntu] Karmic hangs using serial port !

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http://ubuntuforums.org – Hi, I'm having some serious issues with Ubuntu 9.10 / Karmic when trying to use the serial port. Tried with the following laptops : - Dell Latitude D620 (using the built-in serial port); - Dell Latitude E6400 (using a USB to serial adapter). On the D620, sometimes, when the serial port is connected to a serial device (some UNIX servers as well as in a standard desktop), sometimes, Karmic just hangs (not even responding to the power button). Sometimes, scroll lock and caps lock keep flashing. On the E6400, well, since it doesn't have a serial port, I have to use a USB->serial adapter. Actually, all I have to do there is plug in the serial->USB adapter, and wait until the system hangs (I don't even have to connect the serial port to another device!) I searched everywhere I could... And all I was able to find was this similar (but quite different) problem : https://bugzilla.redhat.com/show_bug.cgi?id=431379 Any suggestions?? Thanks! (Hardware)