I installed Ubuntu and could setup to utilize my Intel HD 3000/Geforce GT 540M hybrid graphics perfectly with the method described here: How well do laptops with Nvidia Optimus work? Everything works fine under Kernel 3.2. Now I wanted to upgrade though to Kernel 3.4, as it brings many improvements, especially in saving battery life (ie. Intel RC6)... at least from what I heard. While I had no issues installing the 3.4 Kernel under Ubuntu 12.04 and everything so far runs fine, Bumblebee causes issues under kernel 3.4. When trying to run commands like optirun, lsmod (or similar kernel tools) these just lock up and never return. The Bumblebee developers seem to refuse to help with mainline kernels (as seen here: https://github.com/Bumblebee-Project/bbswitch/issues/17 ). Does anyone know, how to solve this issue? Could I solve this probably, by compiling the kernel and/or Bumblebee against the kernels sources myself and having a Ubuntu-like kernel? Any other idea that might help me to solve this myself, so I could profit from the 3.4 features and Optimus, would be very appreciated.