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[ari <841315@xxxxxxxxxxxxxxxxxx>]

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https://bugs.launchpad.net/bugs/841315

Title:
  on thinkpad-acpi devices, brightness setting ommits most steps

Status in “gnome-power-manager” package in Ubuntu:
  New

Bug description:
  Brightness changes in very rough steps on some Machines, but only when
  there is the gpm-OSD appearing showing the brightness setting. So the
  bug appears not when the session showed is locked, but in an active
  session or on the login screen the bug appears.

  On my machine (thinkpad X60) brightness changes with two steps between
  min and max - these steps are different depending on wether you go up
  or down hough. So you can hit 6 settings. I think the firmware is
  capable I think 8, surely indepent on wether set higher or lower.

  This is found on an X60 Tablet, an Lenovo Netbook (sorry, not sure
  which device exactly) and an X201 Tablet. This leads me to believe
  this is an issue with the thinkpad-acpi kernel module, which has an
  proprietary interface for the screen brightness.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: gnome-power-manager 2.32.0-2ubuntu2
  ProcVersionSignature: Ubuntu 3.0-1.2-generic 3.0.0-rc3
  Uname: Linux 3.0-1-generic x86_64
  Architecture: amd64
  Date: Sun Sep  4 21:28:58 2011
  GnomeSessionIdleInhibited: No
  GnomeSessionInhibitors: None
  GnomeSessionSuspendInhibited: No
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MachineType: LENOVO 6363C7G
  ProcEnviron:
   LANGUAGE=de_CH:en
   LANG=de_CH.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: root=/dev/hostname/ubuntu ro splash quiet cryptopts=source=UUID=fc6bed20-d029-418d-82ca-cf4b932bb6c5,target=hostname-crypt,lvm=hostname-ubuntu loop.max_part=63
  SourcePackage: gnome-power-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/23/2008
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7JET27WW (1.12 )
  dmi.board.name: 6363C7G
  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:bvr7JET27WW(1.12):bd01/23/2008:svnLENOVO:pn6363C7G:pvrThinkPadX60Tablet:rvnLENOVO:rn6363C7G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 6363C7G
  dmi.product.version: ThinkPad X60 Tablet
  dmi.sys.vendor: LENOVO

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