Without any BIOS update, after creating
/usr/share/X11/xorg.conf.d/20-intel.conf with :

Section "Device"
    Identifier "card0"
    Driver     "intel"
    Option     "Backlight"  "intel_backlight"
    BusID      "PCI:0:2:0"
EndSection

the backlight can now be set with xbacklight

but the special keys are not working, and there are not event in
acpi_listen when pressing this keys

BIOS was updated :

sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
X200MA.500
05/04/2014

did not change the problem with the keys

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https://bugs.launchpad.net/bugs/1329510

Title:
  [Asus X200M] Changing Backlight not working

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