gnome-settings-daemon generates wrong notification for Thinklight toggle key (FN-PageUp)

The Thinklight toggle key combination is being seen by the Gnome Settings Daemon in Precise as a 'keyboard step down' key, thus triggering the wrong notification:

** (gnome-settings-daemon:5075): DEBUG: Updating client: index=27 name='ConsoleKit Session /org/freedesktop/ConsoleKit/Session18'
(gnome-settings-daemon:5075): media-keys-plugin-DEBUG: Launching action for key type '52' (on device id 11)
(gnome-settings-daemon:5075): power-plugin-DEBUG: Calling method 'org.gnome.SettingsDaemon.Power.Keyboard.StepDown' for Power
(gnome-settings-daemon:5075): power-plugin-DEBUG: keyboard step down
(gnome-settings-daemon:5075): power-plugin-CRITICAL **: abs_to_percentage: assertion `max > min' failed

The thinkpad_acpi event for the Thinklight key combination is:
ibm/hotkey HKEY 00000080 00001012

The right behaviour should be to not generate any notification for the Thinklight toggle, as in Oneiric, since the Thinklight is not a keyboard backlight, it doesn't have intensity levels (unlike the wrong notification suggests, by showing an always full bar even if the Thinklight has been switched off) and it doesn't make so much sense to have a notification for it.

This bug appeared after updating Oneiric to Precise.

Gnome settings daemon version: 3.4.1-0ubuntu1.1
Computer: IBM Thinkpad X41
Ubuntu version: 12.04 LTS

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-settings-daemon 3.4.1-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic i686
NonfreeKernelModules: hsfengine
ApportVersion: 2.0.1-0ubuntu7
Architecture: i386
Date: Fri May 18 02:53:45 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-settings-daemon
UpgradeStatus: Upgraded to precise on 2012-05-17 (0 days ago)