Public bug reported:

I have the XFCE power manager set to dim the screen to 40% on battery
after 10 seconds. When I unplug my laptop the screen just never dims and
stays at full brightness. I can change brightness fine using the hot
keys on my keyboard, XFCE just refuses to do it automatically.

I have "Monitor Power Management Control" enabled in the power manager.
I tried uninstalling xscreensaver in case that was conflicting, but it
made no change.

I am using xubuntu 12.10 (clean install of daily build yesterday) with
all updates. I have an Asus U52F laptop with an intel video card.

I do not have the gnome settings daemon installed, so I don't know what
else could possibly be conflicting.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: xfce4-power-manager 1.2.0-1ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu3
Architecture: amd64
Date: Wed Oct 17 10:30:51 2012
InstallationMedia: Xubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121015)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: xfce4-power-manager
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xfce4-power-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug quantal

** Description changed:

  I have the XFCE power manager set to dim the screen to 40% on battery
  after 10 seconds. When I unplug my laptop the screen just never dims and
  stays at full brightness. I can change brightness fine using the hot
  keys on my keyboard, XFCE just refuses to do it automatically.
  
  I have "Monitor Power Management Control" enabled in the power manager.
  I tried uninstalling xscreensaver in case that was conflicting, but it
  made no change.
  
  I am using xubuntu 12.10 (clean install of daily build yesterday) with
  all updates. I have an Asus U52F laptop with an intel video card.
  
+ I do not have the gnome settings daemon installed, so I don't know what
+ else could possibly be conflicting.
+ 
  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: xfce4-power-manager 1.2.0-1ubuntu1
  ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
  Uname: Linux 3.5.0-17-generic x86_64
  ApportVersion: 2.6.1-0ubuntu3
  Architecture: amd64
  Date: Wed Oct 17 10:30:51 2012
  InstallationMedia: Xubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121015)
  ProcEnviron:
-  LANGUAGE=en_US:en
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=en_US:en
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  SourcePackage: xfce4-power-manager
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1067749

Title:
  Screen refuses to dim on battery

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