Creative staff has announced that it is ready with its first release of drivers for Sound Blaster X-Fi sound cards, that supports 32-bit Linux. The driver comes in the form of a source tar-ball. The drivers allow seemless operation over ALSA. Updates to the x86_64 drivers are provided as well. This driver applies to all X-Fi series sound cards based on the CA-20K series audio processor. Its known issues include lack of functionality for external I/O modules, and that there are no Linux versions of the applications Creative bundles in its Driver CDs, which work under Windows, as of now.
To download the drivers, select your compatible Sound Blaster X-Fi model from this
page and choose Linux under the manual selection drop-down to list Linux drivers.
Source: Creative Forums