Eventually I reinstalled Ubuntu and installed bumblebee ( http://www.ivegotavirus.com/blog/2012/01/23/installing-bumblebee-3-0-tumbleweed-on-ubuntu/ ) , which gives optimus support. I follow the tutorial and inside it there were instructions how to install the nvidia driver from repository. It works for me now. One very important thing is not to install the restricted drivers Ubuntu is offering immediately after the installation, because they are not good for CUDA and it is very hard to get rid of them.
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