Problem with GNU Screen when using Emacs C-x C-s (save-buffer)
Solution 1
CtrlS is the "Pause transmission" (XOFF) flow control character. Usually it's handled by the tty driver, or in this case Screen. Its opposite is XON, or CtrlQ.
When you launch Emacs, it normally takes over most of the special characters (not just flow control, but also the usual CtrlC "Interrupt", for example).
-
Use C-a
:flow off
to disable flow-control for this Screen window.Confirm with C-a
:info
(look for-flow
in the pop-up). -
If it doesn't help, try
stty -ixon
orstty stop undef
.(You can do it from a separate window using
stty -f /dev/tty1
orstty </dev/tty1
.)
On my system (Linux), Screen does notice when flow control is disabled for the tty. Your OS might have some limitations, though.
Solution 2
I had the same problems with the locked screen and many more when using emacs under screen. For example, C-a in emacs, that brings you to the beginning of the line, gets intercepted by screen and it doesn't work.
SOLUTION:
Create a file .screenrc in you home directory with the following:
#Change escape character to C-u
escape "^uu"
#unbind ctrl+s from xoff in order to be able to search in emacs
bind s
bind ^S
#unbind ctrl+x from lockscreen in order to be able to save in emacs
bind x
bind ^X
Then each time you open a new screen instead of using C-a you need to use C-u to enter a new screen command. The other two changes take care of a couple more things I needed to change in order to be able to use emacs under screen without problems.
simao
Updated on September 17, 2022Comments
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simao over 1 year
When I am using emacs under GNU Screen, if I call C-x C-s screen hangs and does not respond to any keyboard input.
I can't reproduce this, but at least one time per day I have to kill my screen session and restart it.
How can I solve this?
Thanks
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user1686 about 13 yearsWhich Unix? There are many differences in terminal device handling between Linux, BSD, Solaris, ...
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simao about 13 yearsI am actually using Putty to ssh into a Ubuntu Server LTS instance.
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simao about 13 years
:flow off
worked. thanks! any way I can make it permanent? -
user1686 about 13 years@simao: See
defflow
in the manual page ofscreen
. -
pscl about 11 yearsElaborating on @simao and @grawity's comments - To permanently disable flow-control (I assume this is the desired result for most people), add the line
defflow off
to your~/.screenrc
file, or create one in your home directory if it does not already exist. This was sufficient to allow my emacs to function properly inside ascreen
window. This approach should be considered before rebinding any keys. -
JimOfTheNorth about 10 yearsThis resolved the problem for me, but I have yet to learn why "all of a sudden" screen was put into this mode.... perhaps there is some screen key stroke which enables flow control the I inadvertently typed...???
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Rob almost 10 yearsWe're talking about GNU screen and GNU Emacs, and they did not figure out a way to make both work seamlessly ?? ...
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vfclists over 6 years
C-u
is an important key for emacs. I don't think it is a good idea, but the idea of changing .screenrc is the better alternative.