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[dhenry <tfc.duke+launchpad@xxxxxxxxx>]

Well, the main purpose of my comment was to give some hints to Ian with
his laptop, in case it could help him, because we have some common
hardware parts...

I can fill a new bug for my case, but what do you mean by "Ubuntu repository kernel"?
Currently, I'm running the 4.6 kernel from ~kernel-ppa/mainline/, which is also (in some way) an Ubuntu repository, isn't it?
Should I switch back to the standard 4.4 kernel from main repository in order to fill my bug?

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https://bugs.launchpad.net/bugs/1535470

Title:
  Backlight brightness keys not working

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Originally described in bug 1533221. This is a new bug to track this
  additional issue separately.

  The above bug has h/w info attached etc. This is a new skylake
  chipset.

  Backlight function keys are not working. I have tried various
  combinations of:

  acpi_osi=Linux acpi_backlight=native
  acpi_osi=Linux acpi_backlight=vendor
  acpi_osi=! acpi_backlight=vendor
  etc, etc

  with no luck.
  --- 
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ian        2218 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.10
  HibernationDevice: RESUME=UUID=df036c01-8f22-4d8f-ad55-6add4f99f5f4
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 5986:066d Acer, Inc 
   Bus 001 Device 003: ID 8087:0a2b Intel Corp. 
   Bus 001 Device 002: ID 1c7a:0603 LighTuning Technology Inc. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Notebook P65_P67RGRERA
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-0-generic root=UUID=2077d068-d7ee-4407-89e1-7d2b884173de ro acpi_osi=Linux acpi_backlight=native drm.debug=14
  ProcVersionSignature: Ubuntu 4.4.0-0.12-generic 4.4.0
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-0-generic N/A
   linux-backports-modules-4.4.0-0-generic  N/A
   linux-firmware                           1.155
  Tags:  wily
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 4.4.0-0-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 11/20/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.05.10
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: P65_P67RGRERA
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.05.10:bd11/20/2015:svnNotebook:pnP65_P67RGRERA:pvrNotApplicable:rvnNotebook:rnP65_P67RGRERA:rvrNotApplicable:cvnNotebook:ct10:cvrN/A:
  dmi.product.name: P65_P67RGRERA
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook

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