well, I have solved my problem for future reference I would like to share the solution. The solution is so simple; You should run your application with the user that you started ibus-setup / ibus-dameon. For example, if you launch ibus with user A, then only application run with user A will respond by ibus. If your application is running as root, you need to start ibus with root user. That's how I solve the problem. I am sure there is some reason behind this issue but right now I don't have time to deep in.