Bug ID: 410886
Summary: "plasmashell: Playback Stream" application occupies
exclusive audio output device
Platform: Kubuntu Packages
Target Milestone: 1.0
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.
Command line output error message:
"could not open audio device (Device or resource busy)", and no sound is
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.
Audio playback proceeds without problem.
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
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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