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[Edward Lin <yidi.lin@xxxxxxxxxxxxx>]

Backlight control works with the kernel mentioned in #10.
But backlight dims slowly.
System has same behavior on 3.16-r3
Suspect that dim behavior is the hardware/BIOS issue.

I will submit a sauce patch for Dell Inspiron 5547/5447/5737 and Vostro
5470.

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https://bugs.launchpad.net/bugs/1333638

Title:
  [Dell Vostro 5470] Unable to control brightness with the Intel GPU /
  nVidia GPU + proprietary driver

Status in HWE Next Project:
  Invalid
Status in HWE Next trusty series:
  New
Status in HWE Next utopic series:
  Invalid
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  CID: 201307-14038 Dell Vostro 5470

  The brightness cannot be adjusted when running on Intel GPU
  This bug is similar to bug 1332437, but this one is a I+N 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@201307-14038:~$ ls /sys/class/backlight 
  acpi_video0  intel_backlight

  ubuntu@201307-14038:~$ 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:GLAN	  S4	*disabled
  /proc/acpi/wakeup:EHC1	  S4	*enabled   pci:0000:00:1d.0
  /proc/acpi/wakeup:EHC2	  S4	*disabled
  /proc/acpi/wakeup:XHC	  S4	*enabled   pci:0000:00:14.0
  /proc/acpi/wakeup:HDEF	  S4	*disabled  pci:0000:00:1b.0
  /proc/acpi/wakeup:RP01	  S4	*disabled  pci:0000:00:1c.0
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:RP02	  S4	*disabled  pci:0000:00:1c.1
  /proc/acpi/wakeup:PXSX	  S4	*disabled  pci:0000:02:00.0
  /proc/acpi/wakeup:RP03	  S4	*disabled  pci:0000:00:1c.2
  /proc/acpi/wakeup:PXSX	  S4	*enabled   pci:0000:07:00.0
  /proc/acpi/wakeup:RP04	  S4	*disabled  pci:0000:00:1c.3
  /proc/acpi/wakeup:PXSX	  S4	*disabled  pci:0000:08:00.0
  /proc/acpi/wakeup:RP05	  S4	*disabled  pci:0000:00:1c.4
  /proc/acpi/wakeup:PXSX	  S4	*disabled
  /proc/acpi/wakeup:PEG0	  S4	*disabled
  /proc/acpi/wakeup:PEGP	  S4	*disabled
  /proc/acpi/wakeup:PEG1	  S4	*disabled
  /proc/acpi/wakeup:PEG2	  S4	*disabled
  /proc/acpi/wakeup:LID0	  S3	*enabled 

  ubuntu@201307-14038:~$ dmesg | grep 'ACPI: Video'
  [    4.106881] ACPI: Video Device [PEGP] (multi-head: no  rom: yes  post: no)
  [    4.121059] 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/controlC1:  ubuntu     1533 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     1533 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 Jun 24 06:08:39 2014
  HibernationDevice: RESUME=UUID=a006ee47-418d-4b00-a823-81ac84d903e4
  InstallationDate: Installed on 2010-01-01 (1635 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Vostro 5470
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic.efi.signed root=UUID=d578d54f-0310-4907-83ba-ffb8e071368e 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
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/02/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA03:bd10/02/2013:svnDellInc.:pnVostro5470:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Vostro 5470
  dmi.sys.vendor: Dell Inc.

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