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[Yung Shen <1503168@xxxxxxxxxxxxxxxxxx>]

** Also affects: hwe-next
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1503168

Title:
  [Dell Inspiron 5551][8086:0f31] Unable to adjust brightness

Status in HWE Next:
  New
Status in xorg package in Ubuntu:
  New

Bug description:
  Failed to adjust brightness.

  Unable to change brightness with hotkeys or even system settings.

  Additional information:
  There are two backlight interfaces and the system seems to use the wrong one.
  /sys/class/backlight$ ls
  acpi_video0  intel_backlight

  Following commands proof that intel interfaces can controll the backlight:
  sudo sh -c "echo 2500 >> /sys/class/backlight/intel_backlight/brightness"


  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  ProcVersionSignature: Ubuntu 3.13.0-65.106-generic 3.13.11-ckt26
  Uname: Linux 3.13.0-65-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.1-0ubuntu3.15
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  Date: Tue Oct  6 15:25:21 2015
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation ValleyView Gen7 [8086:0f31] (rev 0e) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:06d7]
  InstallationDate: Installed on 2015-10-05 (0 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Inspiron 5551
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-65-generic.efi.signed root=UUID=2e69c3f8-b60b-4e26-beed-33717212e1e9 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/28/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: X16
  dmi.board.asset.tag: AFTPASS
  dmi.board.name: Type2 - Board Product Name1
  dmi.board.vendor: Dell Inc.
  dmi.board.version: Type2 - Board Version
  dmi.chassis.asset.tag: AFTPASS
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: X16
  dmi.modalias: dmi:bvnDellInc.:bvrX16:bd01/28/2015:svnDellInc.:pnInspiron5551:pvrX16:rvnDellInc.:rnType2-BoardProductName1:rvrType2-BoardVersion:cvnDellInc.:ct8:cvrX16:
  dmi.product.name: Inspiron 5551
  dmi.product.version: X16
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.4
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.6
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Tue Oct  6 14:20:56 2015
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                5100
   vendor                                     AUO
  xserver.version: 2:1.15.1-0ubuntu2.7

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