I am using Gnome 3. After upgrading from 11.10 to 12.04, "Ctrl-Alt-S" was reclaimed for use in toggling the shaded state of a window. I have checked the following places, and I haven't been able to find any instance of a keybinding set for toggling the shaded state. System Settings / Hardware / Keyboard / Shortcuts (as per How do I disable Ctrl+Alt+s to minimize a window?) I even tried setting a different shortcut. Made no difference. dconf-editor (now deprecated, from what I've found) gconf-editor/gsettings What am I missing?