I have an external US Robotics v.92 modem connected to COM1. It works fine in Windows XP.
When I install Mandrake Linux 9.1, I set up my dial-up connection in the network configuration settings. It detects my NIC, but it is not plugged in to any network. I disable it.
When I tell the installer to check for updates, it can dial out to my ISP. However, it always disconnects within a few seconds.
When I boot into my shiny new copy of Mandrake, I look for a way to connect to the Internet. Eventually, I stumble upon the network configuration tool in the control center. It tests my existing connection (which isn't up), and I choose to dial it. I get an error that says /dev/modem is busy.
I bring up a console, and I try using wvdial - same problem. I reset the computer and the modem. I still have the same problem. I later re-installed Mandrake, and I chose not to search for updates. I could then connect to the Internet from the control center, but I could only do it once. While I was connected nothing could access the Internet, but there was a connection icon docked in my tray. I disconnected. Later, I tried to reconnect and I got the error about /dev/modem being busy again.
So it's a one hit wonder.
How should I fix this problem? Do you need more information?
I appreciate any help that you can provide me.