Repro Steps: 1. Update Unagi device to build 20130401070203. 2. Open the music app. 3. Attempt to play any song. 4. Observe that no music is played, no album art is displayed, the song time reads 00:00 out of -00:00, there is no song information displayed (artist name and song title are rendered as "Song artist" and "Song album", and the back button is non-funtional. Actual Results: Music app does not play songs and does not display any accurate song info. Expected Results: Music is played, and the artist name, track name, album art, and song time are displayed correctly. Notes: Found on unagi device running the following build: Gecko: http://hg.mozilla.org/releases/mozilla-b2g18/rev/f9f11b8cbf8a Gaia: 663101b6eb809383e5882d9bc3868a923a57998a Build: 20130401070203

Also, the Playlist, Artists, and Albums buttons at the bottom of the screen are not working either.

I will work on finding the regressionwindow for this issue

Regression window results: b2g18 build 20130329070203 – Pass b2g18 build 20130329230204 - Fail removing regressionwindow-wanted

Jim, This issue was casued by the commit lack of bug 838033, it breaks music app on master, but fortunately we found it before any new patch lands, so let's fix this asap, thanks.

And please make this issue be leo+ because the patch of bug 838033 has been uplifted to v1-train, v1-train will also need this patch, thanks.

Comment on attachment 732204 [details] Fix the lack of ModeManager Good catch! r=me

Thanks for responding so quickly, Jim! Landed on master: e2e10f004a7eecf82175d2bab013eedf84689487

(In reply to Dominic Kuo [:dkuo] from comment #7) > Thanks for responding so quickly, Jim! > > Landed on master: e2e10f004a7eecf82175d2bab013eedf84689487 Hey, next time can you close the bug when you land on master -- it doesn't show up in the uplift queues otherwise. v1-train: d06432ad3789ef16e52ac92b8ef231b668088cdd

I was in a hurry to fix the master branch and planning to close the bug after the leo+ flag is set, sorry for the inconvenient, thanks.

Issue no longer appears to be occurring on an Unagi device running the following build: Gecko: http://hg.mozilla.org/releases/mozilla-b2g18/rev/da523063aa7b Gaia: a845be046c5d3cb077e3c78f963ca5c079e7ab3d Build: 20130404070202 Music app seems to work properly, user is able to play songs and the buttons appear to work as they should. Verifying issue as fixed.