Fixing Nvidia + Bumblebee + Dell L502X error in Ubuntu 16.04

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For some weird reason the Ubuntu 16.04 Bumblebee’s default version was not being able to switch on/off my discrete video card NVIDIA Corporation GF108M [GeForce GT 540M]. I was getting the following error:

$ optirun glxgears
[ 7224.163607] [ERROR]Cannot access secondary GPU – error: [XORG] (EE)

[ 7224.163722] [ERROR]Aborting because fallback start is disabled.

I was able to solve the aforementioned issue in this way:

1) Adding the repository with fresh bumbleblee packages:

$ sudo add-apt-repository ppa:bumblebee/testing

2) Updating the repositories and upgrade bumblebee:

$ sudo apt-get update; sudo apt-get upgrade

3) Adjusting /etc/bumblebee/bumblebee.conf file:

4) Adjusting the /etc/bumblebee/xorg.conf-nvidia , as well:

PS.: I suggest you to use the official nvidia-340 video driver, which is the one that I’m currently using with this laptop.

And that’s it! Reboot and pray! =)

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