Pulse Audio

Some nice graphical tools:

sudo apt-get install paprefs pavucontrol

killall pulseaudio pulseudio -v

pacmd list-sinks pacmd list-cards

Only USB camera and NVIDIA HDMI outputs are visible.

pacmd list-cards
 
2 card(s) available.
    index: 0
	name: <alsa_card.pci-0000_01_00.1>
	driver: <module-alsa-card.c>
	owner module: 6
	properties:
		alsa.card = "1"
                alsa.card_name = "HDA NVidia"
 
index: 1
	name: <alsa_card.usb-046d_0825_38C54AA0-02-U0x46d0x825>
	driver: <module-alsa-card.c>
	owner module: 7
	properties:
		alsa.card = "2"
		alsa.card_name = "USB Device 0x46d:0x825"
                device.product.name = "Webcam C270"

$ aplay -l 
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: ALC892 Digital [ALC892 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 8: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 9: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Reloeading UDEV detecection module doesn't help.

pacmd unload-module module-udev-detect && pacmd load-module module-udev-detect

After this I got doubled USB camera and NVIDIA output :(

### Load audio drivers statically
### (it's probably better to not load these drivers manually, but instead
### use module-udev-detect -- see below -- for doing this automatically)
#load-module module-alsa-sink
#load-module module-alsa-source device=hw:1,0
#load-module module-oss device="/dev/dsp" sink_name=output source_name=input
#load-module module-oss-mmap device="/dev/dsp" sink_name=output source_name=input
#load-module module-null-sink
#load-module module-pipe-sink
...
load-module module-udev-detect
...

pusleaudio -v shows lots of

I: [pulseaudio] alsa-util.c: Error opening PCM device front:1: No such file or directory
I: [pulseaudio] (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC1D0c' failed (-2)
I: [pulseaudio] alsa-util.c: Error opening PCM device hw:1: No such file or directory

killall pulseaudio
rm -r ~/.config/pulse/*
pulseaudio -v