19.3.2013 16:55, Fred Smith kirjoitti: > Hi, trying to figure out how the system manages UPS connections. On both > Centos 5.9 and 6.4, merely plugging in a USB UPS device causes an icon > to appear in the top panel, and (at least on 5.9, haven't yet tested > this in 6.4) when the UPS suffers a power failure the system notices > and after a bit does a clean shutdown. If you are using the default GNOME desktop, then that's the GNOME Power Manager: http://projects.gnome.org/gnome-power-manager/ > The question here is: how does this magic all work? It uses DBus and the UPower service. See: http://upower.freedesktop.org/ -- Markku Kolkka markku.kolkka at iki.fi