[Bug 1201865] [NEW] upstart on nexus4 is frequently writing :sys:power_supply-device-changed event messages

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Running fatrace on today's ubuntu touch images on the nexus4 I'm seeing
very frequent upstart messages in  /var/log/upstart/ubuntu-touch-
session-phablet.log

To reproduce:

sudo apt-get install fatrace
cd /
fatrace  -c
init(1): W /var/log/upstart/ubuntu-touch-session-phablet.log
init(1): W /var/log/upstart/ubuntu-touch-session-phablet.log
init(1): W /var/log/upstart/ubuntu-touch-session-phablet.log
init(1): W /var/log/upstart/ubuntu-touch-session-phablet.log

..every second or so an new message is written on an idle phone.

And  tail -f /var/log/upstart/ubuntu-touch-session-phablet.log  shows:

event_finished: Finished :sys:cpu-device-offline event
event_new: Pending :sys:power_supply-device-changed event
Handling :sys:power_supply-device-changed event
event_finished: Finished :sys:power_supply-device-changed event
event_new: Pending :sys:cpu-device-online event
Handling :sys:cpu-device-online event
event_finished: Finished :sys:cpu-device-online event
event_new: Pending :sys:cpu-device-offline event
Handling :sys:cpu-device-offline event
event_finished: Finished :sys:cpu-device-offline event
event_new: Pending :sys:cpu-device-online event
Handling :sys:cpu-device-online event
event_finished: Finished :sys:cpu-device-online event
event_new: Pending :sys:power_supply-device-changed event
Handling :sys:power_supply-device-changed event
event_finished: Finished :sys:power_supply-device-changed event
event_new: Pending :sys:cpu-device-offline event
Handling :sys:cpu-device-offline event
event_finished: Finished :sys:cpu-device-offline event
event_new: Pending :sys:cpu-device-online event
Handling :sys:cpu-device-online event

** Affects: upstart (Ubuntu)
     Importance: Undecided
         Status: Triaged


** Tags: mobile-power-consumption
-- 
upstart on nexus4 is frequently writing :sys:power_supply-device-changed event messages
https://bugs.launchpad.net/bugs/1201865
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