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[Hans Deragon <hans@xxxxxxxxxxx>]

Thank you Ph-Hsu Lin for the clarification.  Users who want to track
this issue with a new report, follow Bug #1389215.

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/562005

Title:
  Backlight controls of laptops with NVIDIA NVS and Quadro FX 880M GPUs
  no longer function while using proprietary drivers

Status in Ubuntu-Certification:
  Invalid
Status in nvidia-graphics-drivers package in Ubuntu:
  Invalid

Bug description:
  The brightness controls of laptops with NVIDIA NVS 3100M or Quadro FX
  880M GPUs work  while running Nouveau or when using a text mode VT,
  but not while running X and using proprietary NVIDIA drivers.  It is
  possible to force the NVIDIA driver to control the backlight by adding
  [Option "RegistryDwords" "EnableBrightnessControl=1"] to the "Devices"
  section of xorg.conf . While this allows the backlight to be
  controlled, the increments are inconsistent and often result in a
  buzzing noise from the LED backlight on Lenovo ThinkPad T510s and
  W510s. Since this did not occur while running nouveau or when
  switching in text VT, something is wrong.

  This bad backlight behaviour has been confirmed on ThinkPad models T510 and W510 with NVIDIA NVS 3100m and Quadro FX 880M chipsets, respectively, via http://www.thinkwiki.org/wiki/Category:T510
  Because this issue is related to NVIDIA's proprietary video driver, this issue can only be solved by them. An NVIDIA developer has said he will investigate the issues, which are  discussed on the nvnews.net forums at http://www.nvnews.net/vbulletin/showthread.php?t=145105 and http://www.nvnews.net/vbulletin/showthread.php?t=150069 . For future reference, the latest NVIDIA drivers can be found in the Ubuntu X-Swat X updates PPA: https://launchpad.net/~ubuntu-x-swat/+archive/x-updates

  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: nvidia-current 195.36.15-0ubuntu2
  ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
  Uname: Linux 2.6.32-19-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  Date: Mon Apr 12 23:48:02 2010
  DkmsStatus:
   nvidia-current, 195.36.15, 2.6.32-19-generic, x86_64: installed
  EcryptfsInUse: Yes
  GdmLog1:

  MachineType: LENOVO 4313CTO
  ProcCmdLine: BOOT_IMAGE=/bhostnamet/vmlinuz-2.6.32-19-generic rhostnamet=UUID=0b95b314-337f-49aa-86f9-6423e76e9f20 ro
  ProcEnviron:
   LANG=en_CA.utf8
   SHELL=/bin/bash
  SourcePackage: nvidia-graphics-drivers
  XorgLogOld:

  dmi.bios.date: 02/22/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6MET49WW (1 tp-smapi, 0.40, 2.6.32-19-generic, x86_64: installed
   vboxnetadp, 3.1.6, 2.6.32-19-generic, x86_64: installed
   vboxnetflt, 3.1.6, 2.6.32-19-generic, x86_64: installed
   vboxdrv, 3.1.6, 2.6.32-19-generic, x86_64: installed.12 )
  dmi.board.name: 4313CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6MET49WW(1.12):bd02/22/2010:svnLENOVO:pn4313CTO:pvrThinkPadT510:rvnLENOVO:rn4313CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4313CTO
  dmi.product.version: ThinkPad T510
  dmi.sys.vendor: LENOVO
  system:
   distro:             Ubuntu
   codename:           lucid
   architecture:       x86_64
   kernel:             2.6.32-19-generic

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