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[Тимофей <nefelim4ag@xxxxxxxxx>]

Christopher, on  13.04 all work fine.

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https://bugs.launchpad.net/bugs/1249219

Title:
  backlight control acpi_video0 instead intel_backlight

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  After upgrading to new release (13.10), when i control brightness,
  system change value in file
  /sys/class/backlight/acpi_video0/brightness instead of
  /sys/class/backlight/intel_backlight/brightness by default. On 12.10
  or older brightness works good.

  ---
  ApportVersion: 2.12.6-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  timofey    2907 F.... pulseaudio
  CurrentDmesg:
   Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
   dmesg: write failed: Broken pipe
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2013-05-28 (169 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: LENOVO HuronRiver Platform
  MarkForUpload: True
  NonfreeKernelModules: wl
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.12.0-2-generic root=UUID=5f54dc08-5f0f-4ab1-bdf2-844517b2419b ro rootflags=subvol=@ acpi_backlight=vendor
  ProcVersionSignature: Ubuntu 3.12.0-2.7-generic 3.12.0
  Tags:  trusty
  Uname: Linux 3.12.0-2-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2013-07-08 (127 days ago)
  UserGroups: audio autopilot libvirtd sudo video
  WifiSyslog:

  dmi.bios.date: 10/27/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 44CN43WW
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Emerald Lake
  dmi.board.vendor: LENOVO
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnLENOVO:bvr44CN43WW:bd10/27/2011:svnLENOVO:pnHuronRiverPlatform:pvrLenovoB570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
  dmi.product.name: HuronRiver Platform
  dmi.product.version: Lenovo B570
  dmi.sys.vendor: LENOVO

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