In bug 836214, when the screen is off/on, we want to save power by stopping/resuming to listen to timeupdate of audio element in Music app, this depends on a reliable mozvisibilitychange event to achieve. For current b2g, mozvisibilitychange does not dispatched to app if the audio is playing and the screen is off, we probably need to fix this or the timeupdate will keep updating the UI while the screen is off.

Bug 828283 looks extremely wrong to me, and I've commented as such. Thanks for catching this.

(adding tracking-b2g18+ as this causing is a power issue we'd like to see fixed sooner rather than later, ideally in v1.1)

Now that bug 853454 has landed, mozvisibilitychange should be dispatched to the music player app when playing w/ screen off right? If so then looks like maybe a patch for this bug is sitting at https://bug836214.bugzilla.mozilla.org/attachment.cgi?id=715860&t=bd5By1ikam

Upgrading bug to leo+ because (1) we have a patch in hand, and (2) power test folks are now flagging this issue.

I hope that for leo, we can have the new AudioChannel API fully implemented. So we can just back port bug 828283.

Bug 828283 has already landed for leo. Did you mean a different bug?

This is really just your patch Dominic :)

Comment on attachment 744014 [details] PR #9495 Looks good, I r+ this because anyone couldn't r+ himself per comment 7.

Change title to reflect the bug/fix.

Thanks Alive! https://github.com/mozilla-b2g/gaia/commit/8728f505c3f7e053dc6ff4158f1dc0cbbfa4ad5e

John, can you please assist with the v1-train uplift?

v1-train: c449f20f7fbe35b2dded35833e602078bd8eef87