I switched off of ATI because even when Regnum detected ATI cards properly, it still always had massive graphical bugs and slowdowns in them.
Games never seem to fully support anything other than NVIDIA, Intel and ATI tend to be just YMMV (Your Milage May Vary).
File a bug report with Frosk and hope that it gets fixed...
Originally Posted by Tenel_Ka
Any way to get it to detect ATI instead of Intel?
Not unless you want the weak Intel graphics to get disabled. If its a laptop, it likely needs them enabled to switch to them on battery power for efficiency.
If you want to disable it entirely and always use the more powerful hardware, there is usually an option in BIOS (DEL or F1 after power-on).