Questions about laptop with NVIDIA optimus

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http://forums.fedoraforum.org – I am a newbie of Fedora and I am using Fedora 18. I have installed bumblebee and it solved my problem of the full speed of laptop fan(kernel 3.7.1). However, after I have updated to the kernel version of 3.8.1, the laptop fan is of full speed again. But I find the bumblebee is still working (the fps of "glxgears -info" is much lower than that of "optirun glxgears -info") Does anyone know how to solve this problem? If any other information is needed, I am able to provide it. Thanks for reading this post. (HowTos)