[Bug 1791372] Re: Keyboard backlight not working on Asus ZenBook Flip UX561UD laptop in Cosmic 18.10, works with 18.04.1 desktop installer live image

[Daniel van Vugt]

*** This bug is a duplicate of bug 1796550 ***
    https://bugs.launchpad.net/bugs/1796550

** This bug has been marked a duplicate of bug 1796550
   [regression] Keyboard brightness control keys (down/up) don't work in cosmic (upower 0.99.8)

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Title:
  Keyboard backlight not working on Asus ZenBook Flip UX561UD laptop in
  Cosmic 18.10, works with 18.04.1 desktop installer live image

Status in acpid package in Ubuntu:
  Invalid
Status in upower package in Ubuntu:
  Fix Released

Bug description:
  Repro:
  1. Press Fn+F3/F4 in fresh install from current Cosmic desktop image, fully updated

  -> Keyboard backlight should come on or change but doesn't.  The
  gnome-shell pop-up icon for the keyboard backlight appears for both
  keys, but the icon's "progress" bar is not visible.

  Kernel version is linux-image-4.17.0-9-generic

  This is the same in X and Wayland session. In case it matters, Nvidia
  binary drivers are installed but Nvidia is switched off via Prime
  setting in nvidia-settings. Running with Intel drivers

  The keyboard backlight works perfectly when booting from the 18.04.1
  desktop live image. When turning on light with 18.04.1, it is off
  again after rebooting into 18.10. (However 18.04.1 seems to freeze
  when shutting down from menu, I have to hard-shut it off).

  Most other important Fn+Fx special keys on this laptop work (display brightness, touchpad off, sound) except for the airplane mode key. However the airplane mode key only fails in gnome-shell but works on the console (this is filed as https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1791367)
  (Not working are a key that seems to mean "display off" and another of unclear purpose that never worked on any laptop I ever saw, maybe "presentation mode" as it seems to depict a flip chart or projection screen). 

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.17.0-9-generic 4.17.0-9.10
  ProcVersionSignature: Ubuntu 4.17.0-9.10-generic 4.17.17
  Uname: Linux 4.17.0-9-generic x86_64
  ApportVersion: 2.20.10-0ubuntu9
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  angela    16196 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Sep  7 22:08:12 2018
  InstallationDate: Installed on 2018-09-05 (1 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180822)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 8087:0a2b Intel Corp.
   Bus 001 Device 003: ID 13d3:5256 IMC Networks
   Bus 001 Device 002: ID 8644:800b Intenso GmbG Micro Line (4GB)
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. UX561UD
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.17.0-9-generic root=UUID=02bad6b5-ca8f-4184-b477-935995e14bdc ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.17.0-9-generic N/A
   linux-backports-modules-4.17.0-9-generic  N/A
   linux-firmware                            1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/06/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX561UD.304
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UX561UD
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 31
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX561UD.304:bd03/06/2018:svnASUSTeKCOMPUTERINC.:pnUX561UD:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX561UD:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct31:cvr1.0:
  dmi.product.family: ZenBook Flip
  dmi.product.name: UX561UD
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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