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[Jason Conti <1311297@xxxxxxxxxxxxxxxxxx>]

I don't know if it is the exact same issue but I am seeing this on my
Asus Eeepc 1001PXD. Narrowed it down to asle_set_backlight() failing
because it is selecting the wrong pipe. There is a commit upstream that
works around this by going through all the connectors and setting the
backlight if one is present: c91c9f32843 drm/i915: make asle
notifications update backlight on all connectors.

I backported this to the ubuntu-trusty.git, and it fixes the issue here.
There was a lot of refactoring in i915 between 3.13 and 3.14-rc1, so
unfortunately the upstream commit doesn't apply directly, but this patch
isn't much different.

Apologies if this isn't the same issue, let me know and I'll go file my
own bug report.

** Patch added: "backport-i915-asle-backlight-connectors.patch"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4109551/+files/backport-i915-asle-backlight-connectors.patch

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https://bugs.launchpad.net/bugs/1311297

Title:
  [ASUS Eeepc 1015PEM] Screen brightness cannot be adjusted

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  This is a regression.  Up to 13.10 there was no problem changing
  screen brightness on my Asus Eeepc 1015PEM.  This machine has function
  keys for changing  the screen brightness up (with Fn+F6) and down
  (with Fn+F5).

  In 14.04 using the function keys causes the indicator to appear and
  the the brightness bar moves appropriately, but there is no change to
  screen brightness.

  Using the slider on the (new?) Brightness and Lock settings form also
  has no affect on the screen brightness.  Operation of the function
  keys will move the slider.  However, repeated use of the function keys
  causes the slider control to disappear from the form (as is found on a
  machine where control of screen brightness by function keys are not
  available).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic i686
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tony       2031 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Apr 22 20:12:48 2014
  HibernationDevice: RESUME=UUID=fcc3dc2b-0a3b-4dcf-98d9-b1f03b2c812e
  InstallationDate: Installed on 2012-04-27 (724 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  MachineType: ASUSTeK Computer INC. 1015PEM
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=abf837ae-032d-4686-8803-27a1376ee9c5 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-20 (2 days ago)
  dmi.bios.date: 10/06/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0801
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: 1015PE
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: x.xx
  dmi.chassis.asset.tag: 0x00000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer INC.
  dmi.chassis.version: x.x
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0801:bd10/06/2010:svnASUSTeKComputerINC.:pn1015PEM:pvrx.x:rvnASUSTeKComputerINC.:rn1015PE:rvrx.xx:cvnASUSTeKComputerINC.:ct10:cvrx.x:
  dmi.product.name: 1015PEM
  dmi.product.version: x.x
  dmi.sys.vendor: ASUSTeK Computer INC.

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