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[Raymond <1397029@xxxxxxxxxxxxxxxxxx>]

index: 8
	name: <alsa_card.usb-Plantronics_Plantronics_C420-00-C420>
	driver: <module-alsa-card.c>
	owner module: 31
	properties:
		alsa.card = "2"
		alsa.card_name = "Plantronics C420"
		alsa.long_card_name = "Plantronics Plantronics C420 at usb-0000:00:1d.0-1.3, full speed"
		alsa.driver_name = "snd_usb_audio"
		device.bus_path = "pci-0000:00:1d.0-usb-0:1.3:1.0"
		sysfs.path = "/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.3/1-1.3:1.0/sound/card2"
		udev.id = "usb-Plantronics_Plantronics_C420-00-C420"
		device.bus = "usb"
		device.vendor.id = "047f"
		device.vendor.name = "Plantronics, Inc."
		device.product.id = "aa14"
		device.product.name = "Plantronics C420"
		device.serial = "Plantronics_Plantronics_C420"
		device.string = "2"
		device.description = "Plantronics C420"
		module-udev-detect.discovered = "1"
		device.icon_name = "audio-card-usb"
	profiles:
		output:analog-stereo: Analog Stereo Output (priority 6000, available: unknown)
		off: Off (priority 0, available: unknown)
	active profile: <output:analog-stereo>
	sinks:
		alsa_output.usb-Plantronics_Plantronics_C420-00-C420.analog-stereo/#5: Plantronics C420 Analog Stereo
	sources:
		alsa_output.usb-Plantronics_Plantronics_C420-00-C420.analog-stereo.monitor/#10: Monitor of Plantronics C420 Analog Stereo
	ports:
		analog-output-speaker: Speakers (priority 10000, latency offset 0 usec, available: unknown)
			properties:
				device.icon_name = "audio-speakers"


ARECORD

**** List of CAPTURE Hardware Devices ****
card 1: PCH [HDA Intel PCH], device 0: ALC3223 Analog [ALC3223 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 2: C420 [Plantronics C420], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

USB Mixer: usb_id=0x047faa14, ctrlif=0, ctlerr=0
Card: Plantronics Plantronics C420 at usb-0000:00:1d.0-1.3, full speed
  Unit: 2
    Control: name="Tone Control - Treble", index=0
    Info: id=2, control=5, cmask=0x0, channels=1, type="S8"
    Volume: min=-40, max=40, dBmin=-15, dBmax=15
  Unit: 2
    Control: name="Tone Control - Bass", index=0
    Info: id=2, control=3, cmask=0x0, channels=1, type="S8"
    Volume: min=-40, max=40, dBmin=-15, dBmax=15
  Unit: 2
    Control: name="Speaker Playback Volume", index=0
    Info: id=2, control=2, cmask=0x3, channels=2, type="S16"
    Volume: min=-12800, max=0, dBmin=-5000, dBmax=0
  Unit: 2
    Control: name="Speaker Playback Switch", index=0
    Info: id=2, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0
  Unit: 5
    Control: name="Mic Capture Volume", index=0
    Info: id=5, control=2, cmask=0x0, channels=1, type="S16"
    Volume: min=-12800, max=0, dBmin=-5000, dBmax=0
  Unit: 5
    Control: name="Mic Capture Switch", index=0
    Info: id=5, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0
  Unit: 7
    Control: name="Sidetone Playback Volume", index=0
    Info: id=7, control=2, cmask=0x0, channels=1, type="S16"
    Volume: min=-7680, max=0, dBmin=-3000, dBmax=0
  Unit: 7
    Control: name="Sidetone Playback Switch", index=0
    Info: id=7, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0


------Mixer controls for card 2 [C420]

Card hw:2 'C420'/'Plantronics Plantronics C420 at usb-0000:00:1d.0-1.3, full speed'
  Mixer name	: 'USB Mixer'
  Components	: 'USB047f:aa14'
  Controls      : 10
  Simple ctrls  : 5
Simple mixer control 'Speaker',0
  Capabilities: pvolume pswitch pswitch-joined
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 25
  Mono:
  Front Left: Playback 10 [40%] [-30.00dB] [on]
  Front Right: Playback 10 [40%] [-30.00dB] [on]
Simple mixer control 'Bass',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 10
  Mono: 5 [50%]
Simple mixer control 'Treble',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 10
  Mono: 5 [50%]
Simple mixer control 'Sidetone',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined
  Playback channels: Mono
  Limits: Playback 0 - 30
  Mono: Playback 22 [73%] [-8.00dB] [on]
Simple mixer control 'Mic',0
  Capabilities: cvolume cvolume-joined cswitch cswitch-joined
  Capture channels: Mono
  Limits: Capture 0 - 25
  Mono: Capture 23 [92%] [-4.00dB] [on]



can you record from card 2 ? 

arecord -vv -D plughw:2 -c 1 | aplay -D plughw:2

you have to provide pulseaudio verbose log

seem pulseaudio bug instead of alsa driver

** Changed in: alsa-driver (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1397029

Title:
  [USB-Audio - Plantronics C420, recording] Headphone Mic do not appear
  after connect

Status in alsa-driver package in Ubuntu:
  Incomplete

Bug description:
  When connecting external USB headphones, only headphones speakers
  appear as an option to output audio, but Microphone only appears
  internal.

  After executing "pulsaudio -k" microphone appears.

  Sometimes (could be unrelated) when external HDMI connector the audio
  HDMI output do not appear. I once solve it Suspending the laptop and
  bringing it back again, then the correct Audio Output options appear.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  Uname: Linux 3.16.0-031600-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Nov 27 09:06:40 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-05-31 (179 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:C420 successful
  Symptom_Card: Plantronics C420 - Plantronics C420
  Symptom_PulseAudioRecordingTest: PulseAudio recording test through plughw:C420 failed
  Symptom_Type: Only some of inputs are working
  Title: [USB-Audio - Plantronics C420, recording] Recording problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/12/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 0845MX
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A07
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd11/12/2013:svnDellInc.:pnInspiron5537:pvrA07:rvnDellInc.:rn0845MX:rvrA00:cvnDellInc.:ct8:cvrA07:
  dmi.product.name: Inspiron 5537
  dmi.product.version: A07
  dmi.sys.vendor: Dell Inc.

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