Nouveau

nouveau is the open source driver for nVidia graphics cards.

Kernel
You need to activate the following kernel options:

grub.conf
The configuration for grub needs to be modified to enable kernel modesetting (KMS). Append the following to the end of the  line in grub.conf:

xorg.conf
The X server is designed to work out-of-the-box, with no need to manually edit X.Org's configuration files. It should detect and configure devices such as displays, keyboards, and mice.

However, the main configuration file of the X server is the xorg.conf.