Guido Conaldi wrote:
> I tried, but also /sys/class/backlight/ is empty in my up-to-date gutsy.
> 

At a console, type:

  sudo modprobe sony_laptop
  sudo modprob sonypi

Then see if /sys/class/backlight is not empty.

If it works, add these lines to /etc/modules and reboot:

  sony_laptop
  sonypi

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In Fiesty Sony Vaio Brigthness Fn keys stopped working
https://bugs.launchpad.net/bugs/90708
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