Public bug reported:

current build number: 241
device name: krillin
channel: ubuntu-touch/ubuntu-rtm/14.09-proposed
last update: 2015-02-20 00:41:40
version version: 241
version ubuntu: 20150219
version device: 20150216-fe747ac
version custom: 20150216-561-29-186

I know we currently have an exception in the lifecycle for music-app,
and it seems that there is a quite critical bug with it at the current
image.

Opening up music-app is already enough for unity8 to hold a system state
request from powerd, blocking suspend until you close the app (having it
in the background doesn't really help here).

Ideally the system state request (wakelock) should just be enabled and
active when the music-app is also active, playing songs.

This bug can drastically affect the battery life for the user of the
phone.

You can check this by running 'powerd-cli list' after opening music-app.
phablet@ubuntu-phablet:~$ powerd-cli list
powerd-cli: Running as user is not fully supported.
System State Requests:
  Name: active, Owner: :1.77, State: 1

** Affects: qtmir (Ubuntu RTM)
     Importance: Undecided
         Status: New

** Affects: unity8 (Ubuntu RTM)
     Importance: Undecided
         Status: New

** Also affects: unity8 (Ubuntu)
   Importance: Undecided
       Status: New

** Package changed: unity8 (Ubuntu) => unity8 (Ubuntu RTM)

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https://bugs.launchpad.net/bugs/1423787

Title:
  music-app blocks system suspend even when not playing any song

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