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For a test purpose, I enabled the org-mode by M-x org-mode in a buffer (e.g., in scratch buffer). How to disable it? Doing again an M-x org-mode does not turn it off.

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    How about replacing it with the desired mode -- M-x fundamental-mode? See also the contents of the function fundamental-mode -- i.e., (kill-all-local-variables) (run-mode-hooks). I take it a step further and remove overlays, and I remove text properties, and some other stuff -- see: emacs.stackexchange.com/a/12527/2287
    – lawlist
    Commented Mar 3, 2017 at 6:14
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    This is no doubt a duplicate of other questions about "turning off" a major mode, but I don't have time now to hunt for a duplicate.
    – Drew
    Commented Mar 3, 2017 at 6:34

1 Answer 1

Reset to default
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Doing again an M-x org-mode does not turn it off.

This convention is for minor-modes - Doing a M-x "minor-mode-name" again disables that minor mode. org-mode is a major mode. When you do this, emacs has no clue which major mode to go into. There must be a major mode always active.

So, rather than disable org-mode, you have to think in terms of which major mode to go into. Fundamental mode, as described in a comment is a choice as good as any.

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    The scratch buffer is in lisp interaction mode when starting Emacs so that would be a good candidate as well
    – YoungFrog
    Commented Mar 3, 2017 at 7:14

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