'upower --monitor' shows that the battery status is updated every 30
seconds ('device changed') while the ac adapter status will never be
updated.When I plug in/out the ac adapter I get a message 'daemon changed' next time the battery status gets updated; after that 'on battery' shows the correct status (ac adapter plugged in: 'no', ac adapter plugged out: 'yes'). However, since the status of device /org/freedesktop/UPower/devices/line_power_ACAD isn't correct, action on critical battery won't be fired when the ac adapter was plugged at boot time. 'udevadm monitor --kernel --udev' shows that the kernel (and udev) never sends an event for none of the two devices (ac adapter & battery). It seems like UPower forces a battery status update every 30 seconds while it doesn't force a status update for the ac adapter. Maybe it would make sense if UPower would force an update not only for the battery but also for the ac adapter.
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