I am looking for help with a setting up a computer that has both AMD and nVIDIA GPUs.

Lots of reading and tweaking xorg.conf and driver installations... all w/o success. Can any of you GPU gurus help?

Simple case:

Linux x86_64 kernel
nvidia GTX2xx GPU
ati 48xx GPU
mobo with many PCIe x16/x16 slots and both cards installed

nvidia cuda/opencl 2.3+ enabled drivers
amd stream SDK 2.0+ drivers

Neither AMD nor nvidia seem to be able to help with this.

Single driver installs are ok for each card.

Installing both nvidia and fglrx driver does not work, apparently due to libglx.so and libGL.so conflicts.