[ubuntu] serial port renumbered and no longer working with os upgrade

view story

http://ubuntuforums.org – Hi all, I just updated a 9.04 machine all the way to 11.04 in the last two days. This machines job is to log serial data from what was the second serial port on the motherboard: /dev/ttyS1 at 38400 8N1. That device name now fails and after much digging, I see that serial ports have been renumbered??? I've done "apt-get purge modemmanager". Here is what I now get for the serial ports from dmesg (I wish I had kept this from before I started the update process) Ubuntu 9.10: Quote: May 27 12:01:54 tide3 kernel: [ 3.404727] serial8250: ttyS0 at I/O 0x3f8 (irq (Hardware)