The discrete nvidia card is not disabled in BIOS. In the first lspci.txt
attached (Raring), the discrete card was disabled by the module bbswitch
(https://github.com/Bumblebee-Project/Bumblebee/wiki/Power-Management).
In the second lspci.txt attached (Live Saucy), the discrete card was not
disabled.

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https://bugs.launchpad.net/bugs/1178796

Title:
  [Asus UL80VT] Backlight control does not work, but there are entries
  in /sys/class/backlight

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