Comment 51 for bug 1178796

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penalvch (penalvch) wrote : Re: [Asus UL80VT] Backlight control does not work, but there are entries in /sys/class/backlight

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
[2] https://help.ubuntu.com/community/BinaryDriverHowto/Nvidia#NVIDIA_drivers_provided_by_the_Ubuntu_repositories