Guillaume Millet, ok. It looks like in Saucy nouveau just failed to enable the discrete card altogether.
Despite this, in your Raring install, if you uninstall Bumblebee (which isn't provided by a supported Ubuntu repository [1]), remove all non-default kernel parameters (ex. video.use_bios_initial_backlight=0), and switched to the nvidia drivers [2], are you then able to adjust your backlight without any further modifications?
Guillaume Millet, ok. It looks like in Saucy nouveau just failed to enable the discrete card altogether.
Despite this, in your Raring install, if you uninstall Bumblebee (which isn't provided by a supported Ubuntu repository [1]), remove all non-default kernel parameters (ex. video.use_ bios_initial_ backlight= 0), and switched to the nvidia drivers [2], are you then able to adjust your backlight without any further modifications?
[1] https:/ /wiki.ubuntu. com/Bumblebee# Installation /help.ubuntu. com/community/ BinaryDriverHow to/Nvidia# NVIDIA_ drivers_ provided_ by_the_ Ubuntu_ repositories
[2] https:/