I suspect that what has happened is that only one of the adapters was initialized and the one that is being used has not.
Please go through the process of uninstalling the fglrx and fglrx-amdcccle again and reboot.
Then, when you initialize during reinstall, use
For reference, please see the ATI wiki in my signature.
sudo amdconfig --adapter=all --initial
Read "2.1. Installing via the command line" and pay attention to item 6, where I have specified using "--adapter=all" for notebook users with multiple GPUs.
You should them be able to use CCC to switch between the two. Switching is not "on-the-fly" as it is with Windows, so you will have to reboot after making the change.