I just tried plugging in my second USB device and only the playback
device was recognized, the microphone was not. Here is the output:
$ fuser -v /dev/snd/*
GEBRUIKER PID SOORT PROGRAMMA
/dev/snd/controlC0: julius 3304 F.... pulseaudio
julius 4056 F.... pulseaudio
/dev/snd/controlC1: julius 3304 F.... pulseaudio
julius 4056 F.... pulseaudio
/dev/snd/controlC2: julius 3304 F.... pulseaudio
julius 4056 F.... pulseaudio
/dev/snd/pcmC0D3p: julius 3304 F...m pulseaudio
/dev/snd/pcmC1D0c: julius 3304 F...m pulseaudio
/dev/snd/pcmC1D0p: julius 3304 F...m pulseaudio
The new device is on /dev/snd/pcmC2* so it doesn't seem to be used by something
else. I'm a bit surprised there are two pulseaudios with different PIDs active
though. Could that be a problem?
I'm in a phone call (pcmC1) and playing music over HDMI (pcmC0D3), so it's
correct it's using those devices. When I do a reboot, it seems the device is
always recognized properly. It's just hot-plugging which doesn't tend to work
correctly.
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https://bugs.launchpad.net/bugs/1325282
Title:
USB microphone inputs not detected by Pulseaudio on Kubuntu Trusty
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