Serial port numbers changing at each boot

Oliver Grawert ogra at
Sun Jul 11 07:11:36 UTC 2010

Am Donnerstag, den 08.07.2010, 19:46 +0300 schrieb Dotan Cohen:
> A machine with a Gigabyte g33 motherboard and two serial expansion
> cards has an interesting situation in which on each boot the serial
> ports get different tty numbers. Why should they change on each boot,
> and how can I prevent that?
> The machine is currently running Ubuntu 10.04. I had run various
> Ubuntus and Debians without issue in the past. Thanks.
try to find something unique to each of the ports in /var/log/udev and
create a udev rule that matches this to create specific device names.

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