I started using AwesomeWM, and use both Dvorak and Qwerty keyboard layouts. The default keybinding for switching keyboard layouts is CTRL+Space. That also happens to be the shortcut for code completion in Eclipse and IntelliJ. How do I disable the shortcut for switching the keyboard layout?
Right-click the keyboard applet, and choose 'Preferences'. There you can find the 'Next input method'. Click the ellipsis (...), press 'Delete' and select 'OK'. Done!