https://bugs.kde.org/show_bug.cgi?id=410886
Bug ID: 410886
Summary: "plasmashell: Playback Stream" application occupies
exclusive audio output device
Product: plasmashell
Version: 5.15.4
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: k...@davidedmundson.co.uk
Reporter: flighter...@gmail.com
CC: plasma-b...@kde.org
Target Milestone: 1.0
SUMMARY
The "plasmashell: Playback Stream" seems to be using up direct audio output
device for audio output, causing audio players unable to use the same direct
audio output to bypass pulseaudio server for bit-perfect audio playback.
Killing plasmashell manually solves this problem with audio playback.
STEPS TO REPRODUCE
1. Install and run Deadbeef through command line.
2. Set "Sound/Output plugin" to "ALSA output plugin", set "Output device" to
something like "HDA Intel PCH, ALC 1220 Analog Direct hardware device without
any conversions" (Or something alike, according to the correct audio hardware
installed on your computer.).
3. Attempt to play a song.
OBSERVED RESULT
Command line output error message:
"could not open audio device (Device or resource busy)", and no sound is
played.
Possible additional error messages:
"ALSA lib pcm_dmix.c:1108:(snd_pcm_dmix_open) unable to open slave"
After manually killing plasmashell (with "killall plasmashell"), music playback
using the same output setting proceeds normally as expected.
EXPECTED RESULT
Audio playback proceeds without problem.
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: Kubuntu 19.04
(available in About System)
KDE Plasma Version: 5.15.4
KDE Frameworks Version: 5.56.0
Qt Version: 5.12.2
ADDITIONAL INFORMATION
Under Audio Volume setting in KDE (Settings/Multimedia/Audio Volume), under
"Applications" tab, two applications can be seen in playback group, which
disappears after "killall plasmashell", they are both named "plasmashell:
Playback Stream". They appear even when no audio is played or heard. After
manually killing plasmashell with the method above, if restart plasmashell,
these two applications in audio setting immediately re-appear.
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