I tried following this tutorial (http://forums.gentoo.org/viewtopic-t-909802-start-0.html
), which also mentions my problem in the discussion to get Intel / Ati Hybrid Graphics working, but it didn't work. After initial config, I can actually start X (as opposed to the experiences in the thread mentioned). but I have NO 3D acceleration. When using only the Intel GPU without having fglrx installed, I have at least its acceleration.
Maybe it's a question of combining the right versions of drivers, does anyone have a working configuration or any hints?