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[Anthony Wong <anthony.wong@xxxxxxxxxx>]

If you pass video.use_native_backlight=1 to the kernel, does brightness
control work?

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

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https://bugs.launchpad.net/bugs/1341988

Title:
  [Dell Inspiron 11 - 3147] Brightness control does not work on this
  system

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  CID: 201403-14888 Dell Inspiron 11 - 3147

  The screen brightness cannot be controlled by the hotkey.

  Steps:
  1. Install 14.04 + update (3.13.0-30), boot to desktop
  2. Try to control brightness with the hotkey
  3. Try to control brightness with "Brightness and Lock" applet

  Expected result:
  * Brightness could be controlled by the hotkey or the applet

  Actual result:
  * Brightness level indicator changed along with the hotkey, but the brightness won't be changed at all.

  Debugging information:
  ubuntu@201403-14888:~$ grep -r . /proc/acpi
  /proc/acpi/button/lid/LID0/state:state:      open
  /proc/acpi/wakeup:Device	S-state	  Status   Sysfs node
  /proc/acpi/wakeup:XHC1	  S0	*enabled   pci:0000:00:14.0
  /proc/acpi/wakeup:RP01	  S4	*disabled  pci:0000:00:1c.0
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:RP02	  S4	*disabled
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:RP03	  S4	*disabled
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:RP04	  S4	*disabled
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:PWRB	  S4	*enabled
  /proc/acpi/wakeup:LID0	  S3	*enabled

  ubuntu@201403-14888:~$ ls /sys/class/backlight/
  acpi_video0  intel_backlight

  ubuntu@201403-14888:~$ dmesg | grep 'ACPI: Video'
  [   10.409549] ACPI: Video Device [PEGP] (multi-head: yes  rom: no  post: no)
  [   10.435109] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-30-generic 3.13.0-30.55
  ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1563 F.... pulseaudio
  CRDA:
   country TW:
    (2402 - 2472 @ 40), (3, 27)
    (5270 - 5330 @ 40), (3, 17), DFS
    (5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Tue Jul 15 02:04:08 2014
  HibernationDevice: RESUME=UUID=b30f45e9-6fc7-4aa0-adff-37e7c87c19cd
  InstallationDate: Installed on 2014-07-15 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Inspiron 11 - 3147
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic.efi.signed root=UUID=cc246aa9-85c1-49ac-b06b-6c0f4e37dbea ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-30-generic N/A
   linux-backports-modules-3.13.0-30-generic  N/A
   linux-firmware                             1.127.4
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/05/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A01
  dmi.board.name: 00K010
  dmi.board.vendor: Dell Inc.
  dmi.board.version: D02
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A01
  dmi.modalias: dmi:bvnDellInc.:bvrA01:bd05/05/2014:svnDellInc.:pnInspiron11-3147:pvr:rvnDellInc.:rn00K010:rvrD02:cvnDellInc.:ct8:cvrA01:
  dmi.product.name: Inspiron 11 - 3147
  dmi.sys.vendor: Dell Inc.

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