If like me you found issue to activate corectly the CATALYST drivers ! try this !
It's work for me.
===========catalyst installation =============
Add rpmfusion non-free repo :
su -c 'yum localinstall --nogpgcheck
http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-18.noarch.rpm'
su -c 'yum install akmod-catalyst'
Before patch :
==========/bin/fglrxinfo==========
X Error of failed request: BadRequest (invalid request code or no such operation)
Major opcode of failed request: 154 (ATIFGLEXTENSION)
Minor opcode of failed request: 66 ()
Serial number of failed request: 13
Current serial number in output stream: 13
================ PATCH : ==================
su -c 'new-kernel-pkg --kernel-args=nomodeset --mkinitrd --dracut --update $(rpm -q --queryformat="%{version}-%{release}.%{arch}\n" kernel | tail -n 1)'
============AFTER PATCH : fglrxinfo ===================
display: :0 screen: 0
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: AMD Radeon HD 6310 Graphics
OpenGL version string: 4.2.11995 Compatibility Profile Context