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[mmmatjaz <mmmatjaz@xxxxxxxxx>]

Kieran's solution doesn't work for me on Xubuntu 15.10 (900X3E). I can edit the values with 
xxd -p /sys/firmware/efi/efivars/KBDBacklitLvl-8be4df61-93ca-11d2-aa0d-00e098032b8c

but they have no effect. Any ideas what else to try?

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https://bugs.launchpad.net/bugs/1203592

Title:
  Keyboard backlight does not work in Samsung Series 9 NP900X4C

Status in gnome-settings-daemon package in Ubuntu:
  Confirmed

Bug description:
  In Ubuntu 13.04, the keyboard backlight does not work in Samsung
  Series 9 NP900X4C.

  Adding the FN key mappings as described in
  https://help.ubuntu.com/community/SamsungSeries9 does show information
  in the notification area when pressing the keyboard backlight's + and
  - buttons, but:

  1) The notification always identifies the backlight as "full max"
  2) It has no effect on the backlight - it's always off

  When I first installed Ubuntu on this machine (12.10), even though the
  fn keys never worked I did have intermitent backlight functionality -
  the light sensor would sometimes work and I'd see light in the
  keyboard.

  I dual boot in Windows 8 and backlighting works there, so this is not
  a hardware issue.

  More discussion can be found here:
  http://askubuntu.com/questions/233312/how-to-make-keyboard-backlight-
  fn-buttons-work-in-samsung-series-9

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