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/