kernel-packages team mailing list archive

[Tommi Helander <1301580@xxxxxxxxxxxxxxxxxx>]

I removed the nvidia driver (331.38) in order to avoid problems when
installing the upstream kernel. This, however, seemed to fix the issue,
because brightness control is now working with the noveau driver and the
stock kernel. This would mean that this is actually a bug in the
proprietary nvidia driver?

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https://bugs.launchpad.net/bugs/1301580

Title:
  Backlight control does not work, but there are entries in
  /sys/class/backlight

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Backlight control doesn't work in Ubuntu 14.04 on a Lenovo Thinkpad
  T61. Neither using hotkeys nor the brightness applet.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-19-generic 3.13.0-19.40 [modified: boot/vmlinuz-3.13.0-19-generic]
  ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
  Uname: Linux 3.13.0-19-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tommi      1964 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Apr  2 22:53:56 2014
  HibernationDevice: RESUME=UUID=3e4b62ed-a926-47a3-ae19-44b96d1376ee
  InstallationDate: Installed on 2014-03-30 (3 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  MachineType: LENOVO 645745G
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-19-generic root=UUID=01d49c75-94f4-417c-beae-d16fd8b8df83 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-19-generic N/A
   linux-backports-modules-3.13.0-19-generic  N/A
   linux-firmware                             1.126
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/06/2007
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7LETA7WW (2.07 )
  dmi.board.name: 645745G
  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:bvr7LETA7WW(2.07):bd12/06/2007:svnLENOVO:pn645745G:pvrThinkPadT61:rvnLENOVO:rn645745G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 645745G
  dmi.product.version: ThinkPad T61
  dmi.sys.vendor: LENOVO

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