Sorry, I forgot to add something.
Earlier I added a x11 conf file:
/usr/share/X11/xorg.conf.d/20-intel.conf
with content:
Section "Device"
        Identifier  "card0"
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        BusID       "PCI:0:2:0"
EndSection

This seems to be needed to actually have the :
xbacklight -dec 10
xbacklight -inc 10
working.

(the device is there and doing this as root will still work without conf:
echo 220 > /sys/class/backlight/intel_backlight/brightness ).

I am going to see if I can fix this and otherwise file a kernel bug.

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https://bugs.launchpad.net/bugs/1348890

Title:
  Asus UX32LN: Brightness keys Fn+F5 and Fn+F6 don't generate evdev
  event

Status in Linux:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hello Community,

  It seems brightness keys don't work with latest Ubuntu 14.04 LTS for
  laptop Asus Zenbook UX32LN.

  sudo dmidecode -s bios-version
  UX32LN.203

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