Comment 8 for bug 22393

I've retried this again a few times and here is the problem that remains: as soon as I assign a shortcut in the "keyboard shortcuts" configurator for Rhythmbox, the key becomes completely unusable (as described above), and can't even be used as the assigned shortcut (because gnome is expecting "ctrl-alt-m" but gets "ctrl-alt-0xf4"). But if I remove the shortcut (using backspace) and then restart gdm the key works again.

I have worked around this by adding keyboard shortcuts in gconf-editor to trigger shell commands (rhythmbox --play-pause, etc.).