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[madvinegar <madvinegar@xxxxxxxxxxx>]

Thank you for your reply. I will test kernel 3.15 and revert with news
(probably later on today).

In the meantime and after reading various reported bugs, I came accross this one:
http://www.aristofunnies.gr/wp-content/uploads/2010/12/photo-12.jpeg

It regards dell xps13, but refers to the exact same GPU (id 8086:0116).
As you will read, the same problem persists especially on kernels after the 3.8, and they way to fix the fn function of the brightness keys in newer kernels is to set from the BIOS the "Load Legacy Option Rom" to "Enabled".

Unfortunately even if I have installed the lasted version of BIOS
proposed by the DELL manufacturer (i.e. version A06), there is no option
for legacy option.

I am just throwing ideas. It may help you go towards the right direction
for solving the bug.


I will revert with news about the 3.15 kernel.

In case you have any suggestions, please let me know.

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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  out of date (it references /usr/share/doc/udev/README.keymap.txt which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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