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[Bug 1203592] Re: Keyboard backlight does not work in Samsung Series 9 NP900X4C


... on my old 14.04 installation the backlit was always on, using CMS
and EFI off.  I switched to EFI because of a CMS-related issue causing
kernel panics

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  Keyboard backlight does not work in Samsung Series 9 NP900X4C

Status in gnome-settings-daemon package in Ubuntu:

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

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

  More discussion can be found here:

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