Comment 15 for bug 221112

I have the same problem with Quod Libet and CodeBlocks.
Xev tells me that "space" key is pressed, but in these apps, everything happens like if ctrl+space was stroke (play/pause in quod libet, completion in codeblocks).
My xorg.conf :

Section "InputDevice"
 Identifier "Generic Keyboard"
 Driver "kbd"
 Option "CoreKeyboard"
 Option "XkbRules" "xorg"
 Option "XkbModel" "pc105"
 Option "XkbLayout" "fr"
 Option "XkbVariant" "oss"
 Option "XkbOptions" "lv3:ralt_switch"
EndSection

Don't you think this could be related to xkeyboard-config package (at least, not specific to rhythmbox) ?