I had also problem to get beryl starting with my clevo d900t mobile x800 and Fedora Core 6.
I tried it by using fglrx from livna and also creating one from ATI website. Both did not work. It took me a lot of time. I had a lot of problem start glx. And after that it still did not start beryl.
Finally I got it working by installing Fedora 7 and installing xorg-x11-drv-ati-6.6.3-2.fc7. Did not need an flrgx. My card is automatically detected and everything works oke now.
Waste of my time to try it with Fedora Core 6. Fedora core 7 has now test4 release. Had one problem
when installing KDE. I did not want to wait so solved it by downloading a newer from Koji. Gnome had no problems.
26 April 2007 F7 Test4 Release
17 May 2007 Final devel freeze
31 May 2007 F7 General Availability