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https://bugs.launchpad.net/bugs/1796550

Title:
  [regression] Keyboard brightness control keys (down/up) don't work in
  cosmic (upower 0.99.8)

Status in linux package in Ubuntu:
  Invalid
Status in upower package in Ubuntu:
  Fix Released
Status in upower source package in Cosmic:
  Fix Released

Bug description:
  * Impact
  keyboard backlight control keys don't work in cosmic

  *  Test case
  On a laptop with keyboard backlight and keys to control the level, try using 
the keys, they should change the level

  * Regression potential
  The change is to lift some systemd process restriction, have extra access 
shouldn't create issue but check that other features like suspend, battery  
pourcentage report, etc keep working

  -----------------------

  https://gitlab.freedesktop.org/upower/upower/issues/73

  ---

  On laptops with two separate (down,up) keys to control the backlit
  keyboard, both keys seem to do nothing. The OSD for the backlit
  keyboard is displayed but no progress bar and no actual effect to the
  backlight. Almost as if the shell only understands laptops with a
  single key for controlling the keyboard backlight...

  Bug verified in cosmic on:
    * Asus UX331UAL
    * Apple Macbook Pro 12,1
    * Apple Macbook Air

  All of them have these keys and they all fail in the same way. However
  it is not a kernel bug. The kernel interface
  (/sys/class/leds/*::kbd_backlight/*) works when I write to it
  directly. This seems to be a problem with Gnome Shell only.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: gnome-shell 3.30.0-3ubuntu1
  ProcVersionSignature: Ubuntu 4.18.0-8.9-generic 4.18.7
  Uname: Linux 4.18.0-8-generic x86_64
  ApportVersion: 2.20.10-0ubuntu11
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Oct  7 13:41:50 2018
  DisplayManager: gdm3
  InstallationDate: Installed on 2018-09-11 (25 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180822)
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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