Sometimes I can't deactivate the mode of selecting text which is C-SPC. Even if I press it a second time and move the cursor, the text still gets selected. I press C-SPC one more time, it activates and selects the text as I move the cursor. Then if I press C-SPC again and nothing changes except the label says "Mark deactivated" but really it's not. In order to really deactivate, I have to click somewhere in a buffer by mouse.

Is this a bug?

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    C-SPC activates and deactivates the mark properly for me. Can you please post the recipe to recreate the misbehavior you see in emacs -Q? If you cannot recreate that issue in emacs -Q, then you would need to progressively comment out your emacs config in halves till you find the culprit in your code. Also what do you see when you do C-h k C-SPC? Does this happen in all the major modes? Does it happen after you do M-x fundamental-mode? Commented May 23, 2016 at 14:12

1 Answer 1


Is this a bug?

No. To deactivate you have to use C-g or use one of the commands that operate on the region and deactivate as a side effect. This is described in the manual:

Whenever the mark is active, you can deactivate it by typing C-g (see Quitting). Most commands that operate on the region also automatically deactivate the mark, like C-x C-u ...

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    C-x C-u is bound to upcase-region by default (from just the excerpts you wrote I got the impression it's supposed to be some kind of deactivate mark command).
    – npostavs
    Commented Jun 22, 2016 at 18:20

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