Trying to change screen brightness auto/manual switch shows the trackpad off OSD instead.

Some Dell laptops have a sensor for auto adjusting screen brightness. In my Dell D630 ATG this is operated by the Fn+left arrow combination.
In oneiric, trying to change this shows the trackpad off osd overlay instead, without really changing the auto brightness nor switching off the trackpad.

To reproduce:
reboot & login;
press Fn + up arrow key to set brightness to maximum;
press Fn + left arrow key combination to set brightness to auto, it always lowers brightness to half;
notice that brightness level doesn't change, but the track pad off OSD overlay is shown instead.
the trackpad stays obviously on. This laptop doesn't have a trackpad on/off switch.

I wonder if it is somehow related to bug #892776

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gnome-settings-daemon 3.2.1-0ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Thu Nov 24 09:38:22 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: gnome-settings-daemon
UpgradeStatus: No upgrade log present (probably fresh install)