Kernel upgrade screws with serial port?

[carlf@panix.com (Carl Fink)]

This is weird.

I recently upgraded to potato.  Some potato packages require kernel
2.2.x, so I downloaded the kernel-source package.  I successfully
compiled the kernel, and it boots fine (after fixing my embarassing
mistake of forgetting to make modules_install).

But:  trying any communications application gets the bizarre message
that /dev/ttyS1 *does not exist*.  The same xterm I started pppd or
minicom from, can ls that very device, but no application can see it.

What the?

If this is more appropriate on, e.g., debian-devel, please tell me.
-- 
Carl Fink		carlf@dm.net
Manager, Dueling Modems Computer Forum
<http://dm.net>