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The output of your command "$ w -s" is:

 15:47:51 up 29 days, 19:50,  2 users,  load average: 0.00, 0.00, 0.00
USER     TTY      FROM               IDLE WHAT
gdm      tty1     -                29days /usr/bin/gjs -m /usr/share/gnome-shell/org.gnome.ScreenSaver
gdm      tty1     -                29days /usr/bin/gjs -m /usr/share/gnome-shell/org.gnome.ScreenSaver