Doesn't something like this:
https://answers.launchpad.net/asus-k...uestion/169520

or
https://github.com/ktoso/g73-keyboar...ster/light_.sh

work on the ux31a? Can't try it at the moment, because i sent my UX31a back for replacement. Had some stuck pixels.
I think that the keyboard backlight can't be turned off is the most annoying bug.

@lmarso:
What exactly works better on 12.10 than 12.04?