Am 08.04.2015 um 13:08 schrieb David Both <dboth at millennium-technology.com>: > The easy way to restart gdm is when you are on the login screen itself or the desktop simply press Ctrl-Alt-Backspace. This works for Upstart in CentOS 6.x but will not work for CentOS 7.x which uses Systemd. The service command does not work for gdm. However, logging out of the desktop will restart gdm. It works for the graphical login exactly like the gettys in a TTY environment. I remember that this "shortcut" is an X11 server feature (it kills the process!) that can be en/disabled. -- LF