Problems with keyboard backlit (Macbook Pro 8.1, openSUSE 13.2)

Hi to all!
Unfortunately I’m having some problems with the functioning of the blacklit keys on my Macbook. Everytime I reboot or I power up my laptop it is impossible to control the keyboard blacklit (not from the keys and not from the bottom panel clicking on the battery icon). The only way to make it work is to exit from an existing session and re-enter, but, when you have a lot of work to do, it is really annoying. Is there a way to fix this?
Thanks very much in advance! :slight_smile: