I have an Asus laptop (G53SW), on which I installed Ubuntu 12.04 (because I had it laying around) which upgraded itself to 14.04LTS.
For the most part it works well but the one annoying issue is that I can't dim the screen at all. Moving the slider or toggling the checkbox does nothing at all.
I have found this previous question and tried the solution involving editing the grub file but that did not help as after making the change and running sudo update-grub the slider still had no effect.
I also found this page but not only did I not have the "Graphics" section mentionned in the post, when I ran: ls /sys/class/backlight what I got back was acpi_video0 acpi_video1, also the post seems to mention this only works for integrated video cards but my laptop has a GTX 460M (for which I'm fairly certain I installed the drivers).
How do I go about restoring the screen dimming functionality?
