Mario,

the referenced kernel bug report was about the backlight, this is about
key maps. So this could be related if pressing the brightness keys
actually produces a KEY_BRIGHTNESSUP/DOWN event, but it's not causing
any actual effect. Can you please follow
/usr/share/doc/udev/README.keymap.txt.gz and use the keymap tool to find
out which key codes are currently being reported when you press the
brightness keys?

-- 
sony ar vgn71 brightness keys do not work correctly
https://bugs.launchpad.net/bugs/625770
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