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[Nils Sabelstrom <nilssab@xxxxxxxxx>]

*** This bug is a duplicate of bug 1173725 ***
    https://bugs.launchpad.net/bugs/1173725

well, the only thing google can find about a bios 2.25 for v5-171 is
this page, so I'm rather sure I'm on the newest bios version..

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https://bugs.launchpad.net/bugs/1324795

Title:
  [Acer Aspire V5-171] backlight cannot be adjusted

Status in “linux” package in Ubuntu:
  New

Bug description:
  changing the backlight slider has no affect of actual screen
  brightness in Ubuntu 14.04 using the 3.13.0-27-generic #50-Ubuntu
  kernel, also exist on latest daily 3.15 kernel marked for trusty tahr.

  apparently works if passing acpi_backlight=vendor

  This is a duplicate made to be able to generate info for tracking
  using ubuntu-bug. Bug is better explained in that report.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-27-generic 3.13.0-27.50
  ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
  Uname: Linux 3.13.0-27-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  nisse      1491 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri May 30 16:15:35 2014
  HibernationDevice: RESUME=UUID=8c53c4f8-af7e-4060-9dd7-35a970de2898
  InstallationDate: Installed on 2014-04-28 (31 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Acer V5-171
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.13.0-27-generic.efi.signed root=UUID=4a013521-bbb5-42f7-9c23-9d20cec1f7fd ro rootflags=subvol=@ quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-27-generic N/A
   linux-backports-modules-3.13.0-27-generic  N/A
   linux-firmware                             1.127.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/26/2013
  dmi.bios.vendor: Acer
  dmi.bios.version: V2.21
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: Mimic
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.21
  dmi.modalias: dmi:bvnAcer:bvrV2.21:bd11/26/2013:svnAcer:pnV5-171:pvrV2.21:rvnAcer:rnMimic:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.21:
  dmi.product.name: V5-171
  dmi.product.version: V2.21
  dmi.sys.vendor: Acer

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