Anyone that purchased a laptop with nVidia Optimus is facing problems with Linux support. In a few words, Optimus is not supported officially ( the best project so far is Bumblebee ). As a result the power draw is more than double compared to integrated card-only systems because both cards are enabled and loaded but only one is in use, the Integrated one.
Bumblebee is a project that tries to bring Optimus support in Ubuntu and so far it had good results but the battery impact was inevitable.
The latest update though changed that and now linux fans can have their Optimus configuration without the enormous battery draw. Follow the steps below to install bumblebee but please note that I am assuming you removed any nVidia drivers you may installed on your own.
We must add the repositories for the bumblebee packages so please type the following in your terminal
CRTL + ALT + T
sudo add-apt-repository ppa:ubuntu-x-swat/x-updates sudo add-apt-repository ppa:bumblebee/stable sudo apt-get update
Now install the bumblebee:
sudo apt-get install bumblebee bumblebee-nvidia
NOTE: If you do not want the discrete card to be enabled at all please use the following command instead:
sudo apt-get install --no-install-recommends bumblebee
This will not install the drivers for your discrete card but if you want in the future to have it just enter the following and get it installed:
sudo apt-get install bumblebee-nvidia
Some people recommend to reboot now although I saw the results without doing so.
If you installed the nVidia driver too, in order to launch a program and use the discrete card you must use the following command:
optirun _appnamehere_ &
In order to get support for 32-bit applications with nVidia you should do the following:
sudo apt-get install virtualgl-libs-ia32
I hope that you will find this guide helpful. I got amazing results with it myself:
Power draw before: 26-28w
Power draw after: 11-13w