Hey Adrien, Could you please still reproduce this issue with newer gnome-settings-daemon version 3.12.1-3 from experimental repository?
I didn't found https://git.gnome.org/browse/gnome-settings-daemon/commit/?h=gnome-3-10&id=6680d0f0812935fa982c2645930e6f0f4c1d93edthis commit on 3.12.1 release. thanks cheers, althaser