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[Bug 1127729] Re: Brightness keys not working in Lenovo Y500


Gorka Navarrette, could you please confirm this issue exists with the
latest development release of Ubuntu? ISO images are available from
http://cdimage.ubuntu.com/daily-live/current/ . If the issue remains,
could you please run the following command in the development release
from a Terminal (Applications->Accessories->Terminal), as it will
automatically gather and attach updated debug information to this

apport-collect -p linux <replace-with-bug-number>

Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:

where VERSION-NUMBER is the version number of the kernel you tested. For example:

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:

If the mainline kernel does not fix this bug, please add the following tags:

As well, please remove the tag:

If you are unable to test the mainline kernel, please comment as to why specifically you were unable to test it and add the following tags:

Once testing of the upstream kernel is complete, please mark this bug's
Status as Confirmed. Please let us know your results. Thank you for your

** Tags added: latest-bios-v1.05 needs-upstream-testing regression-

** Tags removed: kernel-bug-exists-upstream
** Tags added: kernel-bug-exists-upstream-v3.8 raring

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

** Summary changed:

- Brightness keys not working in Lenovo Y500 
+ [Lenovo IdeaPad Y500] Brightness keys not working

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  [Lenovo IdeaPad Y500] Brightness keys not working

Status in “linux” package in Ubuntu:

Bug description:
  Although the brightness keys and brightness indicator behaviour seems
  normal, the actual brightness of the monitor does not change.

  I've tried different solutions as the following  without luck:

  Changing grub to:
  GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor" followed by a grub update

  And changing xorg.conf adding to the Device section:
  Option "RegistryDwords" "EnableBrightnessControl=1"

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-23-generic 3.5.0-23.35
  ProcVersionSignature: Ubuntu 3.5.0-23.35-generic
  Uname: Linux 3.5.0-23-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: amd64
   /dev/snd/controlC1:  emrys      2550 F.... pulseaudio
   /dev/snd/controlC0:  emrys      2550 F.... pulseaudio
  Date: Sat Feb 16 22:09:27 2013
  HibernationDevice: RESUME=UUID=469f9a35-b6af-4c9e-9698-a2a00e707863
  InstallationDate: Installed on 2013-02-13 (3 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: LENOVO 20193
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-23-generic root=UUID=284bcd93-5b33-4537-85ab-eb7a40897731 ro quiet splash
   linux-restricted-modules-3.5.0-23-generic N/A
   linux-backports-modules-3.5.0-23-generic  N/A
   linux-firmware                            1.95
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/29/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6BCN34WW(V1.05)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900003WIN8 STD MLT
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Y500
  dmi.modalias: dmi:bvnLENOVO:bvr6BCN34WW(V1.05):bd11/29/2012:svnLENOVO:pn20193:pvrLenovoIdeaPadY500:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoIdeaPadY500:
  dmi.product.name: 20193
  dmi.product.version: Lenovo IdeaPad Y500
  dmi.sys.vendor: LENOVO

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