Just to clarify this, I'm only speculating here and I'm probably wrong but at least I'd like to rule out this possibility before I continue troubleshooting
Hello,
I just emerged -e world on my machine and I ended up with no keyboard/mouse at kdm's login screen. I have had this problem before and it usually requires reemerging xf86-input-evdev or hal but this time it won't work. So I'm wondering whether HAL support has already been dropped from xorg-server, as announced a few weeks ago (I'm using live ebuilds for xorg-server).
I'm not using an xorg.conf...
Just to clarify this, I'm only speculating here and I'm probably wrong but at least I'd like to rule out this possibility before I continue troubleshooting
Reading the Xorg log will probably tell you what's wrong.
It seems it has indeed been dropped, see http://forums.gentoo.org/viewtopic-t-817825.html
Looks like there is a fix there too.