I still can't fully utilize the nvidia Optimus gfx card under Linux. I've tried the bumblebee project and other suggestions I've found through google, but I'm still stuck with minimal capability. I hear that the latest stable release of ubuntu (14.04?) has added more support for it, so maybe that will work for me.
my optimus card in my w520 works perfectly in 14.04 - and there are task bar widgets for switching now (logout required). After installing 14.04 my external monitors and display switching work perfectly! I was really happy as I was stuck with a non functional gfx card in linux for a few years and now it finally works.
