Fglrx

AMD Catalyst (previous FireGL and Radeon for X) is the proprietary graphics driver for AMD/ATI graphic cards. An open source alternative is radeon.

Hardware support
This driver supports Radeon HD 5400 and newer graphics cards. To check if the card is supported: AMD HCL

AMD provides a legacy driver for unsupported cards or use the radeon driver.

Kernel
You need to activate the following kernel options:

Driver
The actual package name for the driver is

Note the USE flags of :

Initial setup
This will generate an initial xorg.conf which uses the fglrx driver:

If this command fails without error, copy the file to the default location:

Set the OpenGL driver to use fglrx:

Settings
The most comfortable way for most users is to use as a graphical UI to configure the driver. Users might need to be in the video group to change settings:

External resources

 * Community Gentoo Wiki article
 * X.org Wiki