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[madvinegar <madvinegar@xxxxxxxxxxx>]

I installed today kernel 3.14.1. The problem is still present.

I have not tried yet kernel 3.15 as it is in a very early (RC2) stage
yet.


I have also tried hundreds of grub parameters and conf files inside X11 (following the ARCH wiki here: https://wiki.archlinux.org/index.php/backlight) but still I could not make the brightness keys work.


My opinion is that this is clearly a kernel problem. Something that will not be fixed by just adding parameters in grub etc.
The buttons do not produce any kind of result in acpi_listen.

Since this function was working just fine in earlier kernels, it must
mean that there is a change or breakage as regards this aspect in the
newer kernels.

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https://bugs.launchpad.net/bugs/1229591

Title:
  8086:0116 [Dell Inspiron 14z (N411z)] Display brightness keys don't
  generate evdev events after saucy upgrade

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  On raring (and precise) the display brightness keys (fn+f4 and fn+f5)
  on my Dell Inspiron 14z turned the brightness up and down.  After a
  saucy upgrade this no longer happens (I don't see the popup brightness
  bubble either).  The other, similar keys (volume adjustment, etc)
  still work fine.

  Changing the values in /sys/class/backlight/intel_backlight/brightness
  works (temporarily - it gets reset after the screen lock kicks in)

  I tried following the instructions in
  https://wiki.ubuntu.com/Hotkeys/Troubleshooting but this appears to be
  out of date (it references /usr/share/doc/udev/README.keymap.txt which
  does not exist)

  Ubuntu kernel version bisect revealed:
  First bad Ubuntu kernel: 3.11.0-0.2
  last good Ubuntu kernel: 3.10.0-6.17

  The results of a commit bisect are pending.

  ---
  ApportVersion: 2.12.4-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  chris      2646 F.... pulseaudio
  DistroRelease: Ubuntu 13.10
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2011-11-18 (675 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: Dell Inc. Dell System Inspiron N411Z
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-8-generic root=UUID=8bcbab07-7d4f-4c89-b6db-54aeed6ad1c4 ro quiet splash pcie_aspm=force i915.i915_enable_rc6=1 vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-8.15-generic 3.11.1
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-8-generic N/A
   linux-backports-modules-3.11.0-8-generic  N/A
   linux-firmware                            1.114
  Tags:  saucy
  Uname: Linux 3.11.0-8-generic x86_64
  UpgradeStatus: Upgraded to saucy on 2013-09-21 (2 days ago)
  UserGroups: adm admin cdrom davfs2 dialout lpadmin plugdev sambashare
  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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