Hi, I have a Dell XPS L501X laptop. It has nVidia GeForce GT420M graphics card which uses Optimus. My OS is Ubuntu 11.10 (32 bit). I have read that currently the only way to use Optimus graphic cards in Ubuntu is to install Bumblebee or Ironhide. Which one of these is better? I want stable software that does not crash my system. Should I install nVidia driver from official repository (nvidia-current) or ppa:ubuntu-x-swat/x-updates? Also, which profile should I use for configuring Bumblebee/Ironhide? Thanks.