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[Pander <1400050@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1400050

Title:
  Brightness doesn't change anymore in X.Org / GNOME Shell in 14.10

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I have no idea to what package this belongs. Please file it under the
  correct one.

  Brightness doesn't change anymore in X.Org / GNOME Shell in 14.10. It
  stays on maximum (10) and sometimes the less brightness down/less key
  makes it go to 9 or 6. Each time I press the brightness down/less key,
  the overlay with brightness setting shows up (so the key works.

  I can set brightness to any level with
  echo 1 >/sys/class/backlight/acpi_video0/brightness
  echo 2 >/sys/class/backlight/acpi_video0/brightness
  ...
  echo 10 >/sys/class/backlight/acpi_video0/brightness
  and the display responds properly and I can read out the value with
  cat /sys/class/backlight/acpi_video0/brightness
  but changing it with keys only goes from 10 to 9 or 10 to 6.

  This used to work in older versions of Ubuntu. Please fix this and let me know how  I can fix this temporarily.
  --- 
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sander     2450 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 14.10
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=24994e67-9b18-4cad-b387-788beff8b388
  InstallationDate: Installed on 2013-07-06 (520 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: ASUSTeK COMPUTER INC. UX31A
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-25-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-25-generic N/A
   linux-backports-modules-3.16.0-25-generic  N/A
   linux-firmware                             1.138
  Tags:  utopic
  Uname: Linux 3.16.0-25-generic x86_64
  UpgradeStatus: Upgraded to utopic on 2014-10-26 (44 days ago)
  UserGroups: adm cdrom debian-tor dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/31/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX31A.218
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UX31A
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX31A.218:bd01/31/2013:svnASUSTeKCOMPUTERINC.:pnUX31A:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX31A:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: UX31A
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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