@ Fabio : I will try your suggestions as soon as possible
@ Danilo : I tried "radeon.modeset=1" but without success. OpenGL is set to xorg-x11With Sabayon 64-Core and Radeon4.x series was fixed with last upgrade (kernel,xorg-server and xf86-video-ati) but I have "xdm" set to "default" runlevel. and "modules=radeon" in /etc/conf.d/modules.
Changing xdm to boot run-level nothing changes
