LLVM rendered on NV6600 and Fedora 18. How to enable nouveau?

[przemoli]

1) Had no experience with Nvidia hardware for some yers now.
2) Fedora should use nouveau but it do not. Do not know why.
3) Need help in ensuring that nouveau is used (web is full of instructions for proprietary, but finding instruction for nouveau is hard :|).

[przemoli]

Thx for quick replay