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[Mathieu Marquer <mathieu.marquer@xxxxxxxxx>]

I do encounter this bug as well on my Smart Ativ 700. To be more specific :
* With Ubuntu 14.04, you could not control the brightness with the keyboard, but you could do it manually by adjusting the brightness setting in the control panel
* With Ubuntu 14.10 daily, you can control the brightness, but you can not go brighter than what the light sensor finds the "most effictive". For example, if I'm in a dark room, I can only turn off the screen, but cannot make the screen brighter.

Tried with kernel 3..16 final from the PPA above, no improvement.

** Tags added: kernel-bug-exists-upstream

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

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https://bugs.launchpad.net/bugs/1332520

Title:
  backlight bug

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  my keybord back-light dont work samsumg ativ book 6

  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 i686
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jrcosta    2010 F.... pulseaudio
                        jrcosta    3381 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Jun 20 09:36:15 2014
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=93cc3332-e52d-4c4c-8732-d3415dea2ee9
  InstallationDate: Installed on 2014-06-18 (2 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 670Z5E
  ProcFB:
   0 inteldrmfb
   1 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-29-generic root=/dev/mapper/ubuntu--vg-root 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: Upgraded to trusty on 2014-06-18 (1 days ago)
  dmi.bios.date: 04/21/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P05ADG.010.140421.SH
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: NP670Z5E-XD1BR
  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.:bvrP05ADG.010.140421.SH:bd04/21/2014:svnSAMSUNGELECTRONICSCO.,LTD.:pn670Z5E:pvrP05ADG:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP670Z5E-XD1BR:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
  dmi.product.name: 670Z5E
  dmi.product.version: P05ADG
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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