I got a Samsung Series 9 NP900X3E laptop, running Ubuntu 12.04
When I press Fn + F10, the keyboard backlight won't turn on. In the upper right corner, I can see that it recognizes it (with the keyboard backlight icon with the bar next to it), but the bar stays gray and it won't change the light at all.
Now I searched the internet and found this: http://blog.nonobis.nl/?p=11/
I did exactly as stated there. Only I changed the C in 900X3C to E in all the logs (my laptop version).
Nothing has changed after the boot. I'm kind of clueless, since that article was my last hope on fixing it (only found different laptop issues which all were kind of different to my problem).