bug#27901: 25.1; x-win-suspend-error: Cannot suspend Emacs while running under X

[Eli Zaretskii]

> Date: Sat, 05 Aug 2017 11:13:15 +0200
> From: Francesco Potortì <Potorti@isti.cnr.it>
> Cc: 27901-done@debbugs.gnu.org
> 
> >> It would also be nice if the message explained how to close the
> >> graphical frame from the text frame.  I tried
> >>  (delete-frame (next-frame))
> >> from the text frame but the only result was that the text frame became
> >> unusable (not responding to commands any more).
> >
> >I encourage people to propose simple ways of doing that.
> 
> Isn't the above behaviour a bug on its own?  The only way out I found
> was to close Emacs from the graphical frame.

It could be a bug, but if so, it's a separate bug.

And frankly, I don't understand what is the bug here: doing what you
did is not the usual way of deleting all frames but the current one.
I'd try "C-x 5 1" from the TTY frame first.