I have not been able to get my 2 eyefinity 5870 eyefinity 6 machine working with opencl. It currently has 12 projectors hooked up and they work great! (pretty cool, wish you had edge blending, but whatever)
I have practically no debug info other than aticaldd.dll and aticaldd64.dll showing up in the error xml files. No OpenCL apps work. If I rename those DLLs the OpenCL reads the CPU only.
I have played around with 11.5 and 11.5b only on this machine and the 2.2 and 2.4 64-bit sdks.
I've done driver cleaner, etc. I really don't want to reinstall as it took a while to get the 12 projectors setup.