As I've read in http://gentoo-wiki.com/HOWTO_DRI_with_ATi_Open-Source_Drivers 
there's no way to make it work for a Radeon above 9100. Oh !! mine is 
Mobility Radeon 9700, if I want DRI through open source drivers, I've no way 
to do it?

Bye,
Rafael Fernández López.