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[postadelmaga <postadelmaga@xxxxxxxxx>]

According to this comment: 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1229591/comments/27

Kernel version 3.11.0-0.2 is the start of the problem., the last working
saucy kernel was 3.10.0-6.17

What is next ?

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https://bugs.launchpad.net/bugs/1447869

Title:
  Brightness FN  keys Not working - Dell

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  The Brightness FN keys (fn+f4 and fn+f5) once pressed don't generate
  any `evdev` on my Inspiron 14z (N411z). This functionality was working
  fine before.

  ---
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  fra        3202 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.04
  HibernationDevice: RESUME=UUID=5b95e473-75da-434b-9123-66887ff65f11
  InstallationDate: Installed on 2014-03-10 (410 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140309)
  MachineType: Dell Inc. Dell System Inspiron N411Z
  Package: linux (not installed)
  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
  ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
  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
  Tags:  vivid
  UdevLog:

  Uname: Linux 3.19.0-9-generic x86_64
  UpgradeStatus: Upgraded to vivid on 2015-03-20 (34 days ago)
  UserGroups: adm cdrom debian-tor dip disk libvirtd lpadmin plugdev sambashare sudo www-data
  _MarkForUpload: True
  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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