When one tries to shutdown a OLPC XO-1 via the normal halt command one will get a bit of weirdness. No idea what exactly happens, but the device doesn't fully shutdown, but instead gets into a weird mode where the power LED is still on, but the machine no longer reacts properl. No idea if this state is good for anything or just a bug.
Anyway when one actually wants to shutdown the XO-1 properly, one simply can do it the same way as the Sugar GUI does it, by sending dbus message to the power managment, which the following command will do:
dbus-send \
--system \
--dest=org.freedesktop.Hal \
--type=method_call \
--print-reply \
'/org/freedesktop/Hal/devices/computer' \
'org.freedesktop.Hal.Device.SystemPowerManagement.Shutdown'
The XO-1 then shuts down as normal and is properly 'off' once done.
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