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[postadelmaga <postadelmaga@xxxxxxxxx>]

Tested with last upstream kernel `linux-image-4.0.0-040000rc5-generic`
the problem persist.

Yes, the issue started to happen after an update/upgrade, I'm not sure when exactly started.
Anyway if you check bug #122959,  @rpgmaker says "Going over all the versions between 12.10 and 14.04 revealed that 13.04 is the only one where the brightness keys still work. " [0]

Where can I download a very old kernel package ( 13.04 time ) ? or
better a 13.04 iso ? ( so I can test it )

[0]
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1229591/comments/60

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https://bugs.launchpad.net/bugs/1435039

Title:
  [Dell Inspiron 14z (N411z)] brightness FN keys don't generate evdev
  events

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  This is similar to these bugs:

  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1229591
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1280394

  It is not ubuntu related because it affects also other distro (Arch/Fedora).
  It is a regression ( it was working fine on Raring/Precise)  and it is probabbly related to  in the kernel module that manages Dell Hotkeys. (dell_wmi ?? )

  I'm not sure what kind of information I can add here to be helpfull.

  At the present I'm on ubuntu 15.04, the FN key are not working however
  the brightness can be changed manually ( using applet or by shell )

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-9-generic 3.19.0-9.9
  ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
  Uname: Linux 3.19.0-9-generic x86_64
  ApportVersion: 2.16.2-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  fra        4321 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Mon Mar 23 01:08:20 2015
  HibernationDevice: RESUME=UUID=5b95e473-75da-434b-9123-66887ff65f11
  InstallationDate: Installed on 2014-03-10 (377 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140309)
  MachineType: Dell Inc. Dell System Inspiron N411Z
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-9-generic root=/dev/mapper/ubuntu--vg-lv_root ro quiet splash acpi_backlight=vendor intel_pstate=enable vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-9-generic N/A
   linux-backports-modules-3.19.0-9-generic  N/A
   linux-firmware                            1.143
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-03-20 (1 days ago)
  dmi.bios.date: 09/10/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 0P01VP
  dmi.board.vendor: Dell Inc.
  dmi.board.version: FAB1
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA06:bd09/10/2012:svnDellInc.:pnDellSystemInspironN411Z:pvr:rvnDellInc.:rn0P01VP:rvrFAB1:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System Inspiron N411Z
  dmi.sys.vendor: Dell Inc.

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