Assigning custom "Meta+/" to play/pause for Amarok global hotkeys.

[denixx baykin]

Hi!
I tried to assign custom hotkey "Meta+/" to play/payse for amarok globally, as I did in kubuntu 14.10.
It is not working.
If I assign Meta+P, for example - it works well.
Other keys assigned normally and they works well:
Meta+' for hide/show
Meta+, for previous track
Meta+. for next track.

Also I have tried Meta+Alt+/ - it is not working too.

'lsb_release -rd':
Description: Ubuntu 15.04
Release: 15.04

Actually, kubuntu 15.04

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: systemsettings 4:5.2.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: KDE
Date: Fri Apr 24 15:47:27 2015
ExecutablePath: /usr/bin/systemsettings5
InstallationDate: Installed on 2015-04-13 (11 days ago)
InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
ProcEnviron:
 LANGUAGE=ru:en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=ru_UA.UTF-8
 SHELL=/bin/bash
SourcePackage: systemsettings
UpgradeStatus: Upgraded to vivid on 2015-04-24 (0 days ago)
XsessionErrors:
 (process:2433): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
 (process:4972): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed