I'm sorry that the previous post was too long.
This is the summary:
1) "aplay -l" gets called with an empty environment by a script in
ubuntu-drivers-common which Kubuntu runs at startup, through the
"DriverManager_DBus".
"aplay -l" doesn't find a pulseaudio and creates a new one (through libasound),
because it has no environment and no way to know the session on which
pulseaudio is already running.
2) The solution is to: Edit this file:
/usr/share/ubuntu-drivers-common/detect/sl-modem.py
and replace this line:
aplay = subprocess.Popen(['aplay', '-l'], env={},
with this line:
aplay = subprocess.Popen(['aplay', '-l'],
NOTE TO MAINTAINERS: please evaluate if this solution is safe and sound, and if
so, create a patch so that everyone benefits, and can have USB sound devices
usable again (no more "device busy" errors while having an spurious extra
pulseaudio instance).
Cheers,
Juan Manuel Cabo
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https://bugs.launchpad.net/bugs/1296425
Title:
pulseaudio is started twice - effectively making device management
impossible.
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https://bugs.launchpad.net/ubuntu/+source/alsa-plugins/+bug/1296425/+subscriptions
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