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This is something I have asking myself for some time. Imagine the following:

  • I press CTRL+ALT+F1 to switch to TTY1
  • I login there and execute a command
  • I switch back to xorg with CTRL+ALT+F7
  • I forget that I am still logged in in TTY1

Is this a security issue? I guess so as in my test the normal KDE-Lockscreen (Super+L) doesn't log me out of the TTY.

So is there a solution to automatically log out after X seconds (of inactivity)? Or to maybe logout of all TTY whenever I lock my window manager (KDE in my case)?

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There is no integration with DE's lock screen and tty logins.

However, you can restrict bash sessions by setting the TMOUT variable. Edit your /etc/profile and set the following content on it:

export TMOUT=600 
typeset -r TMOUT

Or, to keep things organized, create the file /etc/profile.d/timeout.sh with the same content above, and set the executable bit on it ( chmod +x /etc/profile.d/timeout.sh ).

This will make all bash sessions older than 600 seconds of inactivity to timeout, and typeset -r will set this variable read-only so, users can't change it.

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