How do I check what the kernel supports?
 

I recompiled the kernel and built in PPP support-not as a module
When I try a PPP session I get

"Couldn't set tty to PPP discipline: Invalid argument"
(This is Slack 9.1 and everything used to work before the recompile)
I did a google search and the suggestion is upgrade to the latest and greatest ppp. Makes no sense, since I had ppp working with that kernel
for a long time.

So, the question is: How can I check if I have indeed PPP suport in the kernel?(this is not as a module) -in case I am wrong and have not really
built in ppp support-though I am sure I did

Usually if you have your current kernel sources you can...

cd /usr/src/linux;make menuconfig

or make xconfig

Should bring that up as if you were about to recompile your kernel you can look and see what's compiled into it all ready.

Ok, and I guess abort with ^C if I do not want to make any changes?

or you can
cat /usr/src/linux/.config |grep -i ppp

Look for what is set and not set.

--Shade