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[Launchpad Bug Tracker <704544@xxxxxxxxxxxxxxxxxx>]

[Expired for gnome-power-manager (Ubuntu) because there has been no
activity for 60 days.]

** Changed in: gnome-power-manager (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/704544

Title:
  brightness keys don't work on HP Elitebook 8540p

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

Bug description:
  Binary package hint: gnome-power-manager

  Pressing either the fn f9 (brightness down) or fn f10 (brightness up)
  results in the brightness control appearing on screen, however the
  brightness level is not adjusted, and the on-screen brightness slider
  does not change the position.

  Description:	Ubuntu 10.10
  Release:	10.10

  gnome-power-manager               2.32.0-0ubuntu1
  policykit-1                          0.96-2ubuntu1

  Running gnome-power-manager -v reveals this error when attempting to
  adjust the brightness level

  pkexec /usr/sbin/gnome-power-backlight-helper --set-brightness 23
  **
  ERROR:pkexec.c:124:pam_conversation_function: code should not be reached
  Aborted

  Running the command manually also results in the same error.

  Manually adjusting the brightness via the command line works, for example
  sudo echo 50 >/proc/acpi/video/DGFX/LCD/brightness

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