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[Launchpad Bug Tracker <1583861@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package upower - 0.99.4-2git1

---------------
upower (0.99.4-2git1) yakkety; urgency=medium

  * UpKbdBacklight: Don't cache the brightness level, always read
   it from sysfs. (LP: #1583861)

 -- Martin Pitt <mpitt@xxxxxxxxxx>  Tue, 24 May 2016 14:53:01 +0200

** Changed in: upower (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1583861

Title:
  Keyboard backlight isn't properly restored after idle on systems with
  hardwired configuration

Status in Dell Sputnik:
  New
Status in Upower:
  Unknown
Status in gnome-settings-daemon package in Ubuntu:
  Confirmed
Status in unity-settings-daemon package in Ubuntu:
  Triaged
Status in upower package in Ubuntu:
  Fix Released
Status in gnome-settings-daemon source package in Xenial:
  New
Status in unity-settings-daemon source package in Xenial:
  New
Status in upower source package in Xenial:
  In Progress

Bug description:
  In Dell or ThinkPad (for these you need a kernel which includes fix
  for lp:1574498) notebooks with keyboard backlight, the keybindings to
  control the keyboard backlight don't emit any event to the userland,
  about the state change, nor they request userland to change it (as it
  happens in other models which emits KEY_KBDILLUM{UP,DOWN,TOGGLE}
  events), this causes unity/gnome-settings daemon not to restore the
  proper backlight after idle.

  Steps to reproduce:
   0) ensure your keyboard backlight is on, and
       gdbus call --system --dest org.freedesktop.UPower \
        --object-path /org/freedesktop/UPower/KbdBacklight \
        --method org.freedesktop.UPower.KbdBacklight.GetBrightness
      returns a value != from 0. If not, just call the SetBrightness
      method with a positive value, to turn on the backlight.

      Now turn off the keyboard backlight (or set it to another level)
      using the laptop keys, and run:
       gsettings set org.gnome.desktop.session idle-delay 1
      to make things easier to test.

   2) Wait one second and the screensaver should start. Wait the screen to
      be turned off. If you just changed the brightness level at the step above,
      once the screen is turned off, also the keyboard backlight should be turned off too.

   3) Now press a key or move the mouse.

  Expected behavior:

   4) The keyboard backlight should be set back to the previous level (so it should stay off
      or go back to the level you set before the idle timeout happened).

  Actual behavior:

   5) The backlight is set to the level it had at point 0).

  
  To reset the idle-delay, just call
    gsettings reset org.gnome.desktop.session idle-delay

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