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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

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   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1332379/+attachment/4135236/+files/dmidecode.log

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https://bugs.launchpad.net/bugs/1332379

Title:
  [Dell Inspiron 5547] Unable to control brightness

Status in “linux” package in Ubuntu:
  New

Bug description:
  CID: 201401-14530 Dell Inspiron 5547

  Unable to control the brightness on this system.

  Steps:
  1. Install 14.04 + update (3.13.0-29), boot to desktop
  2. Try to adjust the screen brightness with hotkeys and "Brightness and Lock" applet

  Expected result:
  * Screen brightness could be adjusted in both ways.

  Actual result:
  * Unable to control screen brightness, the brightness indicator would change according to key press on the hotkeys

  Debugging information:
  ubuntu@201401-14530:~$ ls /sys/class/backlight
  acpi_video0  intel_backlight

  ubuntu@201401-14530:~$ grep -r . /proc/acpi
  /proc/acpi/button/lid/LID0/state:state:      open
  /proc/acpi/wakeup:Device	S-state	  Status   Sysfs node
  /proc/acpi/wakeup:P0P1	  S4	*disabled
  /proc/acpi/wakeup:LID0	  S3	*enabled 
  /proc/acpi/wakeup:EHC1	  S0	*enabled   pci:0000:00:1d.0
  /proc/acpi/wakeup:XHC	  S0	*enabled   pci:0000:00:14.0
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:RP03	  S3	*disabled  pci:0000:00:1c.0
  /proc/acpi/wakeup:PEG0	  S4	*disabled
  /proc/acpi/wakeup:PEGP	  S4	*disabled
  /proc/acpi/wakeup:PEG1	  S4	*disabled
  /proc/acpi/wakeup:PEG2	  S4	*disabled

  ubuntu@201401-14530:~$ dmesg | grep 'ACPI: Video'
  [   13.689138] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-29-generic 3.13.0-29.53
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  Uname: Linux 3.13.0-29-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1609 F.... pulseaudio
   /dev/snd/controlC1:  ubuntu     1609 F.... pulseaudio
  CRDA:
   country TW:
   	(2402 - 2472 @ 40), (3, 27)
   	(5270 - 5330 @ 40), (3, 17), DFS
   	(5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Thu Jun 19 21:47:08 2014
  HibernationDevice: RESUME=UUID=7454cf26-0b42-44d7-ac45-01977170fad5
  InstallationDate: Installed on 2014-06-19 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Inspiron 5547
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic root=UUID=3dfa4af3-a788-4fbe-b7db-b895afb04d77 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-29-generic N/A
   linux-backports-modules-3.13.0-29-generic  N/A
   linux-firmware                             1.127.2
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/12/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: X18
  dmi.board.name: 0598GM
  dmi.board.vendor: Dell Inc.
  dmi.board.version: X01
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: X18
  dmi.modalias: dmi:bvnDellInc.:bvrX18:bd02/12/2014:svnDellInc.:pnInspiron5547:pvrX18:rvnDellInc.:rn0598GM:rvrX01:cvnDellInc.:ct8:cvrX18:
  dmi.product.name: Inspiron 5547
  dmi.product.version: X18
  dmi.sys.vendor: Dell Inc.

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