Hi,

Thanks for the tips here, I managed to get keyboard backlight working on
Kubuntu 17.04 with my NP900X3J - Samsung Style S50 (the key to change it
still doesnt works, and requires a reboot). I have to adapt what Kieran
said, what I did was:

# cd /sys/firmware/efi/efivars
# xxd -p KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
0700000004
# lsattr KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852 
----i-------------- KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
# chattr -i KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852 
# lsattr KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852 
------------------- KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
# echo 0700000004 | xxd -p -r > 
KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
# xxd -p KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
0700000004
# chattr +i KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852 
# xxd -p KBDBacklitLvl-5af56f53-985c-47d5-920c-f1c531d06852
0700000004
# sudo reboot

And it started to work with ambient light sensor. thanks!

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

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

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