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output of lsb_release -rd
Description:	Ubuntu oneiric (development branch)
Release:	11.10

Package:
gnome-settings-daemon:
  Installed: 3.1.90-0ubuntu1
  Candidate: 3.1.90-0ubuntu1
  Version table:
 *** 3.1.90-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages
        100 /var/lib/dpkg/status

Expected result: At the login screen, brightness keys increase and
decrease brightness by one step. After logging in, brightness keys
continue to increase and decrease brightness by one step.

Actual result: At the login screen, brightness keys increase and
decrease brightness by one step (same as expected, OK.) After logging
in, brightness increases and decreases by two steps whenever a
brightness key is pressed.

This specifically seems to apply to the POWER plugin for gnome-settings-daemon. setting "active" to false via 
"gsettings set org.gnome.settings-daemon.plugins.power active false" returns the behavior to normal, but removes the gnome power indicator. However, since the battery indicator is present at the login screen, there must be a second application, hotkey, etc, trying to change brightness.
--- 
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
DistroRelease: Ubuntu 11.10
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
NonfreeKernelModules: nvidia
Package: upower 0.9.13-1
PackageArchitecture: amd64
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Tags:  oneiric running-unity
Uname: Linux 3.0.0-12-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

** Affects: upower
     Importance: Unknown
         Status: Unknown

** Affects: gnome-power-manager (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: apport-collected oneiric running-unity
-- 
Double brightness events after logging in.
https://bugs.launchpad.net/bugs/839281
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