the Wiki-Site is great and helped a lot. But i got two issues left...
1. I use Xubuntu 12.04 (64bit) on my UX21A Prime:
How can i change the brightness in Xubuntu? The solutions on the wiki seem to work only with gnome/unity?
2. Not so important, but:
The FN-Keys for changing the brightness of the keyboard illumunation do not work, is there a general solution for that too?