我目前正在帮助岳父使用他的 Ubuntu 机器。他拥有一所私立小学，最近决定从 Windows 切换到 Ubuntu。（耶！）在这种疫情情况下，学校目前采用线下和 Zoom 相结合的教学方式。因此，现在每个教室都配备了内置麦克风的网络摄像头，这样老师就可以自由走动，而不必被传统的有线麦克风束缚在桌子上。
但是，有些机器（不是全部）的麦克风无法正常工作。摄像头工作正常，但 Zoom 检测不到任何声音。需要注意的是，连接在前后麦克风插孔中的麦克风工作正常。只有通过 USB 连接的网络摄像头麦克风无法正常工作。
由于我们对 Ubuntu 都还不太熟悉，因此我们非常感谢您的指导。
操作系统：Ubuntu 20.04.02
如果我应该写任何终端命令来提供您所需的信息，请告诉我。
编辑：
pacmd 列表源
3 source(s) available.
* index: 0
name: <alsa_input.usb-WCM_USB_WEB_CAM-02.multichannel-input>
driver: <module-alsa-card.c>
flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: SUSPENDED
suspend cause: IDLE
priority: 9040
volume: mono: 51401 / 78% / -6,33 dB
balance 0,00
base volume: 65536 / 100% / 0,00 dB
volume steps: 65537
muted: no
current latency: 0,00 ms
max rewind: 0 KiB
sample spec: s16le 1ch 16000Hz
channel map: mono
Mono
used by: 0
linked by: 0
configured latency: 0,00 ms; range is 0,50 .. 2000,00 ms
card: 0 <alsa_card.usb-WCM_USB_WEB_CAM-02>
module: 7
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "USB Audio"
alsa.id = "USB Audio"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "1"
alsa.card_name = "WEB CAM"
alsa.long_card_name = "WCM_USB WEB CAM at usb-0000:00:12.2-3, high speed"
alsa.driver_name = "snd_usb_audio"
device.bus_path = "pci-0000:00:12.2-usb-0:3:1.2"
sysfs.path = "/devices/pci0000:00/0000:00:12.2/usb1/1-3/1-3:1.2/sound/card1"
udev.id = "usb-WCM_USB_WEB_CAM-02"
device.bus = "usb"
device.vendor.id = "1c3f"
device.vendor.name = "WCM_USB"
device.product.id = "2002"
device.product.name = "WEB CAM"
device.serial = "WCM_USB_WEB_CAM"
device.form_factor = "webcam"
device.string = "hw:1"
device.buffering.buffer_size = "64000"
device.buffering.fragment_size = "32000"
device.access_mode = "mmap+timer"
device.profile.name = "multichannel-input"
device.profile.description = "Multicanal"
device.description = "WEB CAM Multicanal"
module-udev-detect.discovered = "1"
device.icon_name = "camera-web-usb"
ports:
multichannel-input: Entrada multicanal (priority 0, latency offset 0 usec, available: unknown)
properties:
active port: <multichannel-input>
index: 1
name: <alsa_output.pci-0000_00_14.2.analog-stereo.monitor>
driver: <module-alsa-card.c>
flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: SUSPENDED
suspend cause: IDLE
priority: 1030
volume: front-left: 65536 / 100% / 0,00 dB, front-right: 65536 / 100% / 0,00 dB
balance 0,00
base volume: 65536 / 100% / 0,00 dB
volume steps: 65537
muted: no
current latency: 0,00 ms
max rewind: 0 KiB
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
Estéreo
used by: 0
linked by: 0
configured latency: 0,00 ms; range is 0,50 .. 1999,82 ms
monitor_of: 0
card: 1 <alsa_card.pci-0000_00_14.2>
module: 8
properties:
device.description = "Monitor of Áudio interno Estéreo analógico"
device.class = "monitor"
alsa.card = "0"
alsa.card_name = "HD-Audio Generic"
alsa.long_card_name = "HD-Audio Generic at 0xfeb40000 irq 16"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:00:14.2"
sysfs.path = "/devices/pci0000:00/0000:00:14.2/sound/card0"
device.bus = "pci"
device.vendor.id = "1022"
device.vendor.name = "Advanced Micro Devices, Inc. [AMD]"
device.product.id = "780d"
device.product.name = "FCH Azalia Controller"
device.form_factor = "internal"
device.string = "0"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
index: 2
name: <alsa_input.pci-0000_00_14.2.analog-stereo>
driver: <module-alsa-card.c>
flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: SUSPENDED
suspend cause: IDLE
priority: 9039
volume: front-left: 30420 / 46% / -20,00 dB, front-right: 30420 / 46% / -20,00 dB
balance 0,00
base volume: 5841 / 9% / -63,00 dB
volume steps: 65537
muted: no
current latency: 0,00 ms
max rewind: 0 KiB
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
Estéreo
used by: 0
linked by: 0
configured latency: 0,00 ms; range is 0,50 .. 1999,82 ms
card: 1 <alsa_card.pci-0000_00_14.2>
module: 8
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "ALC662 rev1 Analog"
alsa.id = "ALC662 rev1 Analog"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "0"
alsa.card_name = "HD-Audio Generic"
alsa.long_card_name = "HD-Audio Generic at 0xfeb40000 irq 16"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:00:14.2"
sysfs.path = "/devices/pci0000:00/0000:00:14.2/sound/card0"
device.bus = "pci"
device.vendor.id = "1022"
device.vendor.name = "Advanced Micro Devices, Inc. [AMD]"
device.product.id = "780d"
device.product.name = "FCH Azalia Controller"
device.form_factor = "internal"
device.string = "front:0"
device.buffering.buffer_size = "352768"
device.buffering.fragment_size = "176384"
device.access_mode = "mmap+timer"
device.profile.name = "analog-stereo"
device.profile.description = "Estéreo analógico"
device.description = "Áudio interno Estéreo analógico"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
ports:
analog-input-front-mic: Microfone frontal (priority 8500, latency offset 0 usec, available: unknown)
properties:
device.icon_name = "audio-input-microphone"
analog-input-rear-mic: Microfone traseiro (priority 8200, latency offset 0 usec, available: no)
properties:
device.icon_name = "audio-input-microphone"
analog-input-linein: Entrada de linha (priority 8100, latency offset 0 usec, available: no)
properties:
active port: <analog-input-front-mic>