Maybe I was lucky. I haven't met any segfault since I installed ati-drivers-8.552-r2.
The only thing I'm complaining about ati-drivers-8.552-r2 is that I still have no luck getting crossfire enabled on my ATI 4870x2.
By the way. AIGLX has been enabled successfully after I installed libstdc++-v3 package
There used to be some error messages in my /var/log/Xorg.0.log:
Installing libstdc++-v3 and re-emerging ati-drivers solved the problem.
(EE) AIGLX error: fglrx exports no extensions (/usr/lib64/dri/fglrx_dri.so:
undefined symbol: __driDriverExtensions)
(EE) AIGLX: reverting to software rendering