GNU bug report logs - #23450
24.5; Lossing DECCKM application sequences on "fg"

Previous Next

Full log

Message #8 received at 23450 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Julien Palard <julien <at> palard.fr>
Cc: 23450 <at> debbugs.gnu.org
Subject: Re: bug#23450: 24.5; Lossing DECCKM application sequences on "fg"
Date: Fri, 23 Aug 2019 20:04:03 +0200

Julien Palard <julien <at> palard.fr> writes:

> We noticed a bug, we're reproducing it like twice a week but we're still
> unable to reproduce it explicitly, sorry for that.
>
> Bug is: After sending emacs to the background with `C-z` and getting it
> back with `fg`, sometimes, our terminal misses the
> [DECCKM](http://www.vt100.net/docs/vt510-rm/DECCKM.html) flag.
>
> We can easily fix it via `(send-string-to-terminal "\e[?1h")`, so we're
> "sure" that this flag the "missing one", but we have no proof emacs is
> faulty here.
>
> It look like we're not alone:
> http://stackoverflow.com/questions/4548106/screen-somehow-unmaps-my-arrow-keys-in-emacs-after-a-z/37032152
>
> Here, we reproduced it with:
>
>  - urxvt, putty, gnome term
>  - emacs 24.5.1, emacs 24.4.1
>  - GNU screen 4.02.01, 4.03.01, tmux 2.2
>  - Debian GNU/Linux 8.4 (jessie)

This sounds a lot like Bug#2772 which was recently closed as unreproducible:
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=2772

Maybe we'll have better luck here.  One good piece of information that
the old bug lacked is that this is not happening consistently.

Are you still seeing this problem in a more recent version of Emacs,
preferably the latest version 26.2?

If the answer is yes, Eli Zaretskii suggested the following in the
discussion about the old bug report:

> A termscript file with all the keyboard input starting from before the
> suspension, from a system where the problem can be reproduced, could
> give us some hints.  See open-termscript.

Could you please provide us with such a termscript file?

Thanks,
Stefan Kangas

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.