12.4 is the last Catalyst to support Radeon HD 2000/3000/4000 series, so if you're using them you probably want to;
# echo ">x11-drivers/ati-drivers-12.4" >> /etc/portage/package.mask And if you're not concerned about 3D or power saving, maybe think about using the "radeon" driver from xf86-video-ati.
