Login screen resolution not set

[Victor Engmark]

After successfully changing the resolution with `gnome-control-center` and logging out, the login screen resolution is back to 640x480 or something.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: gnome-control-center 1:3.6.3-0ubuntu24
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic i686
ApportVersion: 2.9.2-0ubuntu8
Architecture: i386
Date: Sun Apr 28 10:17:20 2013
InstallationDate: Installed on 2013-04-21 (6 days ago)
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release i386 (20130213)
MarkForUpload: True
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to raring on 2013-04-26 (1 days ago)
usr_lib_gnome-control-center:
 activity-log-manager-control-center 0.9.4-0ubuntu6.1
 deja-dup 26.0-0ubuntu1
 gnome-control-center-signon 0.1.6bzr13.04.05-0ubuntu1
 gnome-control-center-unity 1.2daily13.04.09-0ubuntu1
 indicator-datetime 12.10.3daily13.03.26-0ubuntu1