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[TarotChen <tao.chen@xxxxxxxxxxxxx>]

I can reproduce this on krillin-rc274 with following steps:

1.Pair a bluetooth speaker
2.Open the music app and play music
3.Turn off the bluetooth speaker (the playback pauses)
4.Wait a few seconds, then turn on the bluetooth speaker
5.Wait until the speaker reconnects
6.Tap on play button to continue playing

->the sound comes from the phone

7.Close music app
8.Launch music app to play music again

-> now, the sound is routed to Bluetooth speaker

Expected result: 
The sound should be routed to bluetooth speaker after step 6

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Packages, which is subscribed to bluez in Ubuntu.
https://bugs.launchpad.net/bugs/1537737

Title:
  Since Bluez5, headsets don't reconnect audio when reconnecting

Status in Canonical System Image:
  Confirmed
Status in bluez package in Ubuntu:
  Confirmed

Bug description:
  Pairing a Bluetooth headset (A2DP) seems to work fine. After pairing,
  the phone successfully switches to transmit audio over Bluetooth. When
  disconnecting the Headset again, the phone successfully switches audio
  back to the integrated speaker. However, on a reconnect without
  pairing, the headset seems to connect properly, but it doesn't route
  audio any more to the headset. Despite the headset being connected,
  audio is still routed to the integrated speaker. A reboot does not
  seem to help. The only way to get back to Bluetooth audio streaming is
  to delete the device from the settings, and pair it again, which makes
  it work once again.

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