I would like to share this problem because this situation probably occurs in near future

My situation is here

1. I created soundmanager-binding that dispatch events of control indication of output sound from Audio Manager.
2. I modified Mediaplayer and Phone application to get clearance for output to SoundManager and to react the indication.
3. Installed the modified applications and soundmanager
4. Audio Manager policy statement is not modified

The number in the figure is the sequence number.

Problem

 Background ringing doesn't work 

This may be related to https://jira.automotivelinux.org/browse/SPEC-395 .

I heard SPEC-395 is caused because mediaplayer is not rendered if it is on background, then mediaplayer doesn't proceed next song.

In this situation, phone application is not also rendered. (I checked by LayerManagerControl get scene)

I guess this is caused because 6. event or 7. ringing is not work in the background.

If user change phone application to be rendered (top surface), the ringing starts.

I guess QML thread stops in the background for some reason.

I'm welcome for any advises/hints about QML event handling. Thank you in advance.

ringing_problem.log