I'm having a problem with an external US Robotics 56K Faxmodem. I'm running a Potato system with the 2.2.12 kernel on a Toshiba Tecra 700CT. I have never gotten the modem to work with Linux before, but I have used it with Windows.
The problem is this: when I run Minicom (or anything else that requires the modem) the modem is unresponsive. The TR light -- Data Terminal Ready light -- gets lit up and the modem won't "talk" to the software. The same light also goes on when I run statserial to check the serial port. However, there is definitely some communication between the OS and the modem. When I exit Minicom or statserial the TR light goes off. Also, when I re-initialize the modem within Minicom the light temporarily goes off. Also, when I updated my ppp connection with pppconfig I told it to search for all available modems and it found the modem (which is attached to /dev/ttyS0); when it was searching, all the lights on the modem briefly flashed. I've checked the dip switches on the modem and they seem fine -- they are set to the factory default, which includes the DTR switch off (I've tested it with it on as well; no good). The serial port, /dev/ttyS0, also seems fine. I have support for the serial port loaded as a module and when I type lsmod it shows up. I don't think I have a getty running on the serial port (I checked /dev/ttyS0). The info from setserial seems fine and I don't think that I have any conflicts (from /proc/interrupts). I'm stumped and any help would be much appreciated, especially since I've managed to disable my PCMCIA modem (which may soon be the subject of another post). Thanks.
