I Can't start X 1.4. Version 1.3 works, but if I try to start version 1.4 I get this error message:
QUOTE
(EE) module ABI major version (2) doesn't match the server's version (1)
(EE) Failed to load module "v4l" (module requirement mismatch, 0)

(EE) module ABI major version (2) doesn't match the server's version (1)
(EE) Failed to load module "nv" (module requirement mismatch, 0)
dlopen: /usr/lib64/xorg/modules/input//kbd_drv.so: undefined symbol: clientJumpBuf
(EE) Failed to load /usr/lib64/xorg/modules/input//kbd_drv.so
(EE) Failed to load module "kbd" (loader failed, 7)
dlopen: /usr/lib64/xorg/modules/input//mouse_drv.so: undefined symbol: GetMotionHistory
(EE) Failed to load /usr/lib64/xorg/modules/input//mouse_drv.so
(EE) Failed to load module "mouse" (loader failed, 7)
(EE) No drivers available.

What am I doing wrong?

Solved. The problem was that x11-server-xdmx wasn't upgraded to 1.4 and that blocked some other packages from being upgraded and there was a version mismatch in X. Reading the description I didn't think needed it, so I removed that RPM and then X worked again.