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tmux prints random characters when starting or attaching #4535
Description
Issue description
When running tmux or tmux attach the session starts by inputting characters into the terminal (Like I typed them), see image:
These are the characters "11;rgb:0c0c/0c0c/0c0c", they seem to always be the same.
Proposed solution
After tmux starts a session or attaches to it, have tmux run Ctrl+U to clear the current line in the terminal.
https://codemia.io/knowledge-hub/path/how_do_i_cleardelete_the_current_line_in_terminal
Or find underlying issue and fix that which would be nicer but the proposed solution is I think good enough.
Note
It seems some other people have had this problem and have found a workaround solution
https://superuser.com/questions/417027/why-are-random-characters-inserted-into-my-tmux-session
There it seems this issues is dependent on utf8 and a mouse.
I think tmux would be a better program if it didn't matter which mouse you had or what you're mouse settings are when you start a tmux session or attach to an already running one.
Required information
- tmux version (
tmux -V): 3.5a - Platform (
uname -sp): Linux unknown uname -r: 5.10.237-1-MANJARO- $TERM inside and outside of tmux (
echo $TERM): tmux-256color - Logs from tmux (
tmux kill-server; tmux -vv new).
Activity
nicm commentedon Jun 18, 2025
What terminal?
G0rocks commentedon Jun 18, 2025
ah sorry, missed that one.
zsh.
We should add it to the required information in the issue template.
nicm commentedon Jun 18, 2025
No, that is the shell. What terminal are you running tmux in?
G0rocks commentedon Jun 18, 2025
Ah sorry, i'm using the terminal app on windows with an ssh connection to the linux computer which uses the zsh shell.
G0rocks commentedon Jun 18, 2025
This one:
https://apps.microsoft.com/detail/9n0dx20hk701?hl=en-US&gl=US
nicm commentedon Jun 18, 2025
Does this still happen if you build tmux from master?
G0rocks commentedon Jun 18, 2025
idk, I haven't tried that. I just did
sudo pacman -S tmuxand started using it today.G0rocks commentedon Jun 18, 2025
It does not seem to be happening every time also which is weird but (and I have not counted) I feel like it's around 50/50 chance.
nicm commentedon Jun 20, 2025
OK let me know when you have tried master.
solace-rcampbell commentedon Jun 23, 2025
I have been noticing this recently too. I have tried it on every terminal I can get my hands on:
I tried using other terminals like Tabby, or the one built into VS Code, but they consume too many keybindings that I use to control tmux (specifically Alt+Left & Alt+Right).
solace-rcampbell commentedon Jun 23, 2025
I tried building it from master, but I just get this (Fedora 42):
That's running via an ssh connection to my Fedora 42 machine.
G0rocks commentedon Jun 24, 2025
I'm sorry but I won't try the latest developmental version. My goal was just to notify the developers of tmux about this issue, suggest a fix and answer questions that would help with debugging it. My goal is not to debug this myself. Sorry but I've got other work to do.
G0rocks commentedon Jun 24, 2025
@solace-rcampbell thank you for opening issue #4541 to actually solve this problem, I appreciate it ^_^
@nicm. In this situation, I posted an issue, when you closed it before a solution was found and without explaining why you closed it. That makes me feel like you don't care about the project having bugs.
I don't know why but my gut says you closed the issue because I said I was not going to solve the issue myself. If that is the case I would point out that not everybody that contributes to an open source software project does coding (as talked about here), some people just point out things and that's ok too :)
In the future, please either explain why the issue is being closed or leave it open for somebody else to deal with at another time. That will, I believe, help the projects you participate in the most.
Thank you.
nicm commentedon Jun 24, 2025
I closed it because you won't work with me to find the problem, you were simply wasting my time. Nobody expects you to fix the code yourself, but I can't debug problems that you have, you need to help.
G0rocks commentedon Jun 24, 2025
Thanks for letting me know.
I'm sorry you felt that way, it wasn't my intention. I'm willing to work together and help. I felt like you wanted me to extend a finger and then you were going to take my arm and I don't want that.
github-actions commentedon Jul 25, 2025
This issue has been automatically locked since there has not been any recent activity after it was closed.