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[Merlijn Sebrechts <merlijn.sebrechts@xxxxxxxxx>]

** Tags added: kernel-bug-exists-upstream

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https://bugs.launchpad.net/bugs/1399611

Title:
  Screen brightness not working acer aspire 5742

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  My laptop does not respond to the screen brightness control after default Ubuntu install. The following workaround worked: http://askubuntu.com/a/450594
  It adds a config file to /usr/share/X11/xorg.conf.d/

  adding acpi_backlight=vendor to boot params did nothing
  adding acpi_osi=Linux to boot params only fixed the keyboard shortcuts, but the screen indicator and the brightness settings dialog stopped working.

  Please let me know if this is not the right package, or if you need
  more info.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-40-generic 3.13.0-40.69
  ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
  Uname: Linux 3.13.0-40-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  lies       2944 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Dec  5 12:06:41 2014
  HibernationDevice: RESUME=UUID=36715a89-8cd7-40cd-8d29-94f983036914
  InstallationDate: Installed on 2014-11-23 (11 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  Lsusb:
   Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 003: ID 04f2:b1d8 Chicony Electronics Co., Ltd 
   Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Acer Aspire 5742
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-40-generic root=UUID=1bc3ee22-b016-4fcc-9668-30363b56faa9 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-40-generic N/A
   linux-backports-modules-3.13.0-40-generic  N/A
   linux-firmware                             1.127.10
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/11/2010
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.04
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Aspire 5742
  dmi.board.vendor: Acer
  dmi.board.version: V1.04
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.04
  dmi.modalias: dmi:bvnAcer:bvrV1.04:bd08/11/2010:svnAcer:pnAspire5742:pvrV1.04:rvnAcer:rnAspire5742:rvrV1.04:cvnAcer:ct10:cvrV1.04:
  dmi.product.name: Aspire 5742
  dmi.product.version: V1.04
  dmi.sys.vendor: Acer

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