Control+Alt+S shortcut is used for toggling shaded state in MATE desktop environment. Once toggled, a window’s content is hidden except for the title bar. It’s useful for peeking at the content behind a window. I personally never use it as I usually just Alt+Tab or place two windows side by side. I prefer to disable it so I can use the ‘Save As’ shortcut in Notepad++.
There are two methods of disabling the shortcut. Use the second method if Compiz is enabled with CCSM (CompizConfig Settings Manager).
Toggle shaded state in Keyboard Shortcuts. Disable the shortcut by clicking on the
Ctrl+Alt+S and backspace.
If you use Compiz, the shortcut is not shown in Keyboard Shortcuts due to conflict with CSSM. You need to manually disable it by editing a dconf value. dconf value can be easily edited through dconf-editor which you can install through
apt or any other package managers.
Launch dconf-editor and search (click on the search icon on top right corner or just Ctrl+F) for ‘shaded’.
Simply navigate into
Toggle ‘Use default value’ to off, and set the custom value as
Finally, disable the shortcut in CCSM. Go to General Options > Key bindings (tab) > Toggle Window Shaded (last value).