Hey people! Some good news. This solution worked for me, and a couple of guys 
from ubuntuforums:
http://ubuntuforums.org/showthread.php?p=9242651#post9242651

Edit /etc/default/grub and add ”acpi_backlight=vendor” to GRUB_CMDLINE_LINUX, 
so that it looks like this: 
GRUB_CMDLINE_LINUX=”acpi_backlight=vendor”

update your grub:
sudo update-grub

and restart!

Hope it helps!

-- 
[LUCID Beta 1] Brightness Fn keys don't work as expected on Sony Vaio VGN 
FW35G. Regression.
https://bugs.launchpad.net/bugs/546201
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