dbus-monitor
- use
dbus-monitor --system
dbus-monitor --session "type='signal',interface='org.freedesktop.PowerManagement'"
- exit
Ctrl+Z kill
http://fixunix.com/suse/247365-how-exit-dbus-monitor.html
- misc
https://wiki.ubuntu.com/DebuggingGNOMEPowerManager
https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/37626