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[Launchpad Bug Tracker <1450568@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package powerd - 0.16+15.04.20150507-0ubuntu1

---------------
powerd (0.16+15.04.20150507-0ubuntu1) vivid; urgency=medium

  [ Ricardo Mendoza ]
  * Watch com.canonical.Unity.Screen vanishing from the bus (USC/Unity8
    not running) to hold a lock until either we poweroff, or Unity
    returns. Also, add a delay for clearing requests from dead bus names
    (LP: #1452300) (LP: #1452300)

 -- CI Train Bot <ci-train-bot@xxxxxxxxxxxxx>  Thu, 07 May 2015 22:33:15
+0000

** Changed in: powerd (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1450568

Title:
  Requests are not cleared if a client dies unexpectedly and drops from
  the bus

Status in the base for Ubuntu mobile products:
  Fix Committed
Status in PowerD:
  In Progress
Status in powerd package in Ubuntu:
  Fix Released

Bug description:
  Power requests (wakelocks) are not released if the owner process
  unexpectedly exits and drops off the bus. This causes a stale request
  that holds the device awake, which can result in extreme battery
  drain.

  For example, the vibration sensor can unexpectedly die while holding a
  vibration/alarm lock and at the point the phone would never again
  suspend.

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