I installed catalyst, so I needed to downgrade to xorg-server-1.11 from xorg-server-1.12. Now I use the [xorg111] repo and I understood that because of the udev, which works for the new xorg-server I have to recompile it. I don't really know how to recompile it so it works with it.
Q: How do I do the manual compilation?
Here is the thread in Arch forum if this helps.