[Trisquel-users] Re : Trisquel logs out without any (obvious) reason

[lcerf]

If that is it, set that parameter up from "Brightness and lock" in the  
"System settings".

If the display manager really terminates abruptly, log in a real terminal  
(that you can get with Ctrl+Alt+F1 or Ctrl+Alt+F2 or ... or Ctrl+Alt+F6),  
where you can use Emacs by the way, and take a look at the relevant logs  
(/var/log/Xorg.0.log, /var/log/lightdm/*.log if you use LightDM,  
/var/log/gdm/*.log if you use GDM, etc.).