X Server
X.Org Server 1.7
Releases prior to 1.8 made use of HAL for input device configuration.
X.Org Server 1.8
This release features udev input device management (HAL will be deprecated in the long run), it also adds xorg.conf.d directory support to simplify configuration. You no longer need a /etc/X11/xorg.conf or the previous HAL .fdi files.