Dual screen with fedora 17 on lenovo thinkpad E525 with ATI

After getting gray more and more searching for the right answer to my problem with the catalyst driver and the dual screen options I figured something out:

1. get the newest catalyst e.g. through RPMfusion or via script from amd
2. uncomment the blacklist entry in /etc/modprobe.d folder
   for intel and radeon, because their chipset is used as well
3. now catalyst should work with the newest xorg,
   my system reloaded some intel packages after yum distro-sync 

 Now I have my second screen going after setting up catalyst
to single-desktop with multiple screens, and then Xinerama.

In the future I will post some insights of me setting up a working server,
because now its more comfortable to programm and edit files.