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https://bugs.launchpad.net/bugs/1354313

Title:
  [Dell Inspiron 5721] Brightness control does not work with
  12.04.5(with kernel 3.13)

Status in HWE Next Project:
  Triaged
Status in “linux” package in Ubuntu:
  Invalid
Status in “linux-lts-trusty” package in Ubuntu:
  Invalid
Status in “linux” source package in Precise:
  Invalid
Status in “linux-lts-trusty” source package in Precise:
  Fix Committed
Status in “linux” source package in Trusty:
  Fix Committed
Status in “linux-lts-trusty” source package in Trusty:
  Invalid
Status in “linux” source package in Utopic:
  Invalid
Status in “linux-lts-trusty” source package in Utopic:
  Invalid

Bug description:
  This is a system installed with latest stable 12.04.5 image.

  The Brightness key will invoke the osd-notify indicator but the
  display brightness won't change.

  Verifying the value changing in backlight interface, system are using
  acpi_video0 instead:

  Steps to monitor the backlight interfaces:

  Press the brightness key until maxium indicator shows:

  ubuntu@201210-11863:/sys/class/backlight$ cat intel_backlight/brightness ; cat acpi_video0/brightness
  3407
  99
  ubuntu@201210-11863:/sys/class/backlight$

  Press the brightness key until to minimum indicator shows:

  ubuntu@201210-11863:/sys/class/backlight$ cat intel_backlight/brightness ; cat acpi_video0/brightness
  3407
  0

  -

  The workaround found here could solve this issue:
  http://itsfoss.com/fix-brightness-ubuntu-1310/

  -
  Verified with other kernels:

  linux-image-generic 3.2.0.67.79 =  brightness control works
  linux-image-generic-lts-quantal 3.5.0.54.59 =  brightness control works

  There is possible regression in following kernels:
  linux-image-generic-lts-raring 3.8.0.44.44 = brightness control not work
  linux-image-generic-lts-saucy 3.11.0.26.23 =  brightness control not work

  -

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xorg 1:7.6+12ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-32.57~precise1-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  Date: Fri Aug  8 03:51:43 2014
  DistUpgraded: Fresh install
  DistroCodename: precise
  DistroVariant: ubuntu
  DkmsStatus: fwts-efi-runtime-dkms, 14.07.00, 3.13.0-32-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, even including gdb or git bisection work if needed
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:05ba]
   Advanced Micro Devices, Inc. [AMD/ATI] Mars [Radeon HD 8730M] [1002:6601] (rev ff) (prog-if ff)
  InstallationMedia: Ubuntu 12.04.5 LTS "Precise Pangolin" - Release amd64 (20140807.1)
  MachineType: Dell Inc. Inspiron 5721
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=93a24f68-72a1-4335-938a-75f624f57e68 ro quiet splash initcall_debug vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/25/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 0KNF68
  dmi.board.vendor: Dell Inc.
  dmi.board.version: X01
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A12
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd10/25/2013:svnDellInc.:pnInspiron5721:pvrA12:rvnDellInc.:rn0KNF68:rvrX01:cvnDellInc.:ct8:cvrA12:
  dmi.product.name: Inspiron 5721
  dmi.product.version: A12
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.7.12-0ubuntu4
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1~precise1
  version.libgl1-mesa-dri: libgl1-mesa-dri N/A
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A

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