Comment 5 for bug 1912052

I have a DELL XPS-8940 and both a usb mic or 3.5mm jack mic do not work.
They are detected by the operating system and listed in Input section of sound settings, but they do not work, no sound is detected when talking or recording.

        *-multimedia
             description: Audio device
             product: Comet Lake PCH cAVS
             vendor: Intel Corporation
             physical id: 1f.3
             bus info: pci@0000:00:1f.3
             version: 00
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi bus_master cap_list
             configuration: driver=snd_hda_intel latency=32
             resources: irq:165 memory:e5418000-e541bfff memory:e5100000-e51fffff

         *-multimedia
                description: Audio device
                product: TU104 HD Audio Controller
                vendor: NVIDIA Corporation
                physical id: 0.1
                bus info: pci@0000:01:00.1
                version: a1
                width: 32 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list
                configuration: driver=snd_hda_intel latency=0
                resources: irq:17 memory:e5080000-e5083fff

$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC3861 Analog [ALC3861 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 2: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

The strange thing is that the mic on my Logitech Webcam C310 works just fine.