How to do G Ethminer for Nvidia/AMD system?

I currently need to run two batch files:
ethminer -G --opencl-platform 1
ethminer -U

I read the help file but cannot get one job to work with the -X command.
-X,--cuda-opencl Use OpenCL + CUDA in a system with mixed AMD/Nvidia cards. May require setting --opencl-platform 1

Shouldn't it just be:
ethminer -X --cuda-opencl --opencl-platform 1
???