I am also having problems.
After cleaning off my 8.0 partitions I went to install slackware 9.0.
Install went smooth etc, did a full install (except for gnome)
As usual I went and got the kernel source and latest patch from kernel.org (2.4.20 with the pre4 patch so my agp/soundcard works right, I have a fairly new mobo)
After patching, then configuring, make dep, make install,make modules, make modules_install etc I rebooted.
Then I got loads of errors about dependencys and /lib/modules/2.4.20/modules.dep
and I cant load the modules I need (ppp, etc)
I do a uname -a and see that its showing im using 2.4.20 instead of 2.4.20-pre4.
I even did a make bzImage in the kernel directory, and update lilo myself, move System.Map to / and /boot etc, nothing working.
Even if I try to use a 2.2.x or 2.5.x (just for testing) it will still say 2.4.20.
It will run fine if I use the kernel that slack came with it, but what would be the point if my sound doesn't work that good or my agp was crap and would freeze while trying to play 3d games?
AMD XP 2100 with 512 megsof DDR ram agp 8x MSI limited edition mobo cmedia sound via chipset etc etc.
Any help would be appriciated.