Screen backlight brightness reverts when power source changes

[Brady Garvin]

Unplugging or plugging in my laptop (System76 Lemur Ultra [limu4]) causes the screen backlight to jump to very bright. Setting org.gnome.settings-daemon.plugins.power to false in dconf-editor works around the problem, but nothing in the power plugin's source code jumps out at me. (Though I was looking at https://launchpad.net/ubuntu/saucy/+source/gnome-settings-daemon/3.8.5-0ubuntu11.1/+files/gnome-settings-daemon_3.8.5.orig.tar.xz, which I'm not sure is the correct archive.)

The problem began for me after upgrading to Saucy. If someone can tell me how to install from source over the distributed build, I can do a bzr bisect.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: gnome-settings-daemon 3.8.5-0ubuntu11.1
ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
Uname: Linux 3.11.0-13-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Sat Nov 16 06:54:56 2013
InstallationDate: Installed on 2012-10-18 (393 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
SourcePackage: gnome-settings-daemon
UpgradeStatus: Upgraded to saucy on 2013-10-17 (29 days ago)

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/GNOME. If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.