desktop-misc@gentoo.org Gentoo Desktop Miscellaneous Project If no user activity is detected after a set timeout, xautolock runs a program for you. If you want that program (with optional arguments) to be a screen locker, then one of these packages might fit your purpose: x11-misc/alock x11-misc/i3lock x11-misc/slim x11-misc/slock x11-misc/xlockmore x11-misc/xtrlock