Inconsistent behavior for some keyboard shortcuts: user is able to bind them, but pressing them does nothing

[Andrei Dziahel]

Repro:

1. Set 'Launch media player' shortcut to <Super>XF86Play (media key with "Play" icon on it) (either with GUI, either with `gsettings set org.gnome.settings-daemon.plugins.media-keys media '<Super>XF86AudioPlay'`)
2. Press just assigned shortcut key.

What happens: nothing.
What is expected: default media player is launched.

This affects shortcuts like'<Super>XF86Back' and '<Super>XF86Forward' as well.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-settings-daemon 3.4.2-0ubuntu0.4
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
Uname: Linux 3.2.0-32-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu14
Architecture: amd64
Date: Tue Oct 9 14:50:23 2012
EcryptfsInUse: Yes
ProcEnviron:
 LANGUAGE=en_US:en
 TERM=gnome-256color
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
SourcePackage: gnome-settings-daemon
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Andrei Dziahel (develop7)]

is there any additional info I can provide to get this bug fixed?

[Andrei Dziahel (develop7)]

UPD: Remapping "Lock screen" action to "<Super>L" does nothing too (just prints "l" in current input).

[Andrei Dziahel (develop7)]

Is there any way I can improve this bugreport? Or any clues where I should start investigating?

[Andrei Dziahel (develop7)]

Replacing <Super> with <Mod4> got this fixed.