Bug 397685

Summary:	Plasma panel hangs when audio player process is stopped
Product:	[Plasma] plasmashell	Reporter:	Sebastian Dicke <sdicke>
Component:	Media Player	Assignee:	Kai Uwe Broulik <kde>
Status:	RESOLVED FIXED
Severity:	normal	CC:	kde, nate, plasma-bugs
Priority:	NOR
Version:	5.13.1
Target Milestone:	1.0
Platform:	Debian testing
OS:	Linux
Latest Commit:	https://commits.kde.org/plasma-workspace/eac5d2e40e1edaf258d9ce8181666326c333c412	Version Fixed In:	5.13.5

Description Sebastian Dicke 2018-08-20 20:57:24 UTC

Steps to reproduce:

1. Play a audio file with a media player which playback can be controlled with a widget in plasma panel.
2. Send a SIGSTOP to the media player process.
3. Press playback start/stop shortcut or key.
4. Click on any place on the plasma panel. No reaction is noticeable.
5. Send a SIGCONT to the media player process previously stopped.
6. The expected reactions to the clicks on the panel occurs.

The same behaviour occurs with openSUSE builds from version 5.13.4. The behaviour occurs both with VLC and dragon player. I am not sure which component is responsible for this behaviour so I chose component general as component to report the bug.

Comment 1 Kai Uwe Broulik 2018-08-21 09:03:39 UTC

Can confirm, does a blocking DBus call from the mpris dataengine. At least when pressing the keyboard shortcuts.

Comment 2 Kai Uwe Broulik 2018-08-23 14:48:28 UTC

Git commit eac5d2e40e1edaf258d9ce8181666326c333c412 by Kai Uwe Broulik.
Committed on 23/08/2018 at 14:47.
Pushed by broulik into branch 'Plasma/5.13'.

[MPRIS Data Engine] Avoid blocking calls in media shortcuts handling

All the information we need (player capabilities and playback status) is already present and managed by the PlayerContainer
FIXED-IN: 5.13.5

Differential Revision: https://phabricator.kde.org/D14970

M  +16   -27   dataengines/mpris2/multiplexedservice.cpp
M  +5    -0    dataengines/mpris2/playercontrol.h

https://commits.kde.org/plasma-workspace/eac5d2e40e1edaf258d9ce8181666326c333c412