gnome-screensaver is a session daemon that monitors user input, and if the mouse has not been moved, or the keyboard been pressed then it starts a timeout. When the value of this timeout reaches the value set in gnome-screensaver-preferences, then the login is marked as 'session idle'. This is when GNOME Power Manager performs all the session idle actions such as enabling low-power mode and lowering the laptop panel brightness.
gnome-screensaver saioen daemon-ak erabiltzailearen sarrera monitorizatzen du, eta, sagua mugitu ez bada edo teklarik sakatu ez bada, denbora-muga bat abiarazten du. Denbora-muga horren balioa gnome-screensaver-preferences komandoan ezarritako baliora iristean, saio-hasiera hori 'saio inaktibo' gisa markatzen da. Orduan, GNOME Energia-kudeatzaileak abian jartzen ditu saio inaktiboko ekintza guztiak: energia baxuko modua gaitzea, eta eramangarriaren panelaren distira jaistea, esate baterako.