Just found out, these keys do work in Rhythmbox but only when the window is focused, whenever Rhythmbox is minimized to the notification area, the keys stop working.
-- Gnome CD player isn't controlled by multimedia keys https://launchpad.net/bugs/12178 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
