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[Launchpad Bug Tracker <1399823@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

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

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https://bugs.launchpad.net/bugs/1399823

Title:
  [Samsung NP730U3E-S01PL] LCD backlight doesn't work

Status in linux package in Ubuntu:
  Expired

Bug description:
  Backlight, no LCD, neither keyboard, doesn't work.

  echo 1 > /sys/class/backlight/intel_backlight/brightness #nothig changes
  echo 0 > /sys/class/backlight/intel_backlight/brightness #turns off LCD backlight

  there is no /proc/sys/video/use_native_backlight

  acpi_backlight =... # no effect at all

  # grep . /sys/class/backlight/intel_backlight/*
  /sys/class/backlight/intel_backlight/actual_brightness:8
  /sys/class/backlight/intel_backlight/bl_power:0
  /sys/class/backlight/intel_backlight/brightness:8
  grep: /sys/class/backlight/intel_backlight/device: Jest katalogiem
  /sys/class/backlight/intel_backlight/max_brightness:4650
  grep: /sys/class/backlight/intel_backlight/power: Jest katalogiem
  grep: /sys/class/backlight/intel_backlight/subsystem: Jest katalogiem
  /sys/class/backlight/intel_backlight/type:raw

  # dmesg|grep 'ACPI: Video'
  [    1.766081] ACPI: Video Device [PEGP] (multi-head: yes  rom: no  post: no)
  [    1.767014] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no

  # lspci |grep VGA
  00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-25-generic 3.16.0-25.33
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  Uname: Linux 3.16.0-25-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  kasia      2021 F.... pulseaudio
  Date: Sat Dec  6 00:16:19 2014
  HibernationDevice: RESUME=UUID=aa9f54d4-8ed7-4e2b-9107-8ffa2b36e88e
  InstallationDate: Installed on 2014-12-05 (0 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 730U3E/740U3E
  ProcEnviron:
   LANGUAGE=pl
   TERM=xterm
   PATH=(custom, no user)
   LANG=pl_PL.UTF-8
   SHELL=/bin/bash
  ProcFB:
   0 inteldrmfb
   1 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-25-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash acpi_backlight=vendor vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  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
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/26/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P07ABW.065.140226.dg
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: NP730U3E-S01PL
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: SEC_SW_REVISION_1234567890ABCD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP07ABW.065.140226.dg:bd02/26/2014:svnSAMSUNGELECTRONICSCO.,LTD.:pn730U3E/740U3E:pvrP07ABW:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP730U3E-S01PL:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
  dmi.product.name: 730U3E/740U3E
  dmi.product.version: P07ABW
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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