External microphone not working with Logitech C270 webcam

The webcam itself works. There are drivers for it for Windows and Mac, but I couldn’t find any for Manjaro.

[jr@fm ~]$ pacmd list-cards
3 card(s) available.
    index: 1
        name: <alsa_card.pci-0000_07_00.1>
        driver: <module-alsa-card.c>
        owner module: 7
        properties:
                alsa.card = "0"
                alsa.card_name = "HDA NVidia"
                alsa.long_card_name = "HDA NVidia at 0xf6080000 irq 100"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:07:00.1"
                sysfs.path = "/devices/pci0000:00/0000:00:03.1/0000:07:00.1/sound/card0"
                device.bus = "pci"
                device.vendor.id = "10de"
                device.vendor.name = "NVIDIA Corporation"
                device.product.id = "10f8"
                device.product.name = "TU104 HD Audio Controller"
                device.string = "0"
                device.description = "TU104 HD Audio Controller"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        profiles:
                output:hdmi-stereo: Digital Stereo (HDMI) Output (priority 5900, available: unknown)
                output:hdmi-stereo-extra1: Digital Stereo (HDMI 2) Output (priority 5700, available: unknown)
                output:hdmi-stereo-extra2: Digital Stereo (HDMI 3) Output (priority 5700, available: no)
                output:hdmi-surround-extra2: Digital Surround 5.1 (HDMI 3) Output (priority 600, available: no)
                output:hdmi-surround71-extra2: Digital Surround 7.1 (HDMI 3) Output (priority 600, available: no)
                output:hdmi-stereo-extra3: Digital Stereo (HDMI 4) Output (priority 5700, available: no)
                output:hdmi-surround-extra3: Digital Surround 5.1 (HDMI 4) Output (priority 600, available: no)
                output:hdmi-surround71-extra3: Digital Surround 7.1 (HDMI 4) Output (priority 600, available: no)
                output:hdmi-stereo-extra4: Digital Stereo (HDMI 5) Output (priority 5700, available: no)
                output:hdmi-surround-extra4: Digital Surround 5.1 (HDMI 5) Output (priority 600, available: no)
                output:hdmi-surround71-extra4: Digital Surround 7.1 (HDMI 5) Output (priority 600, available: no)
                output:hdmi-stereo-extra5: Digital Stereo (HDMI 6) Output (priority 5700, available: no)
                output:hdmi-surround-extra5: Digital Surround 5.1 (HDMI 6) Output (priority 600, available: no)
                output:hdmi-surround71-extra5: Digital Surround 7.1 (HDMI 6) Output (priority 600, available: no)
                output:hdmi-stereo-extra6: Digital Stereo (HDMI 7) Output (priority 5700, available: no)
                output:hdmi-surround-extra6: Digital Surround 5.1 (HDMI 7) Output (priority 600, available: no)
                output:hdmi-surround71-extra6: Digital Surround 7.1 (HDMI 7) Output (priority 600, available: no)
                off: Off (priority 0, available: unknown)
        active profile: <output:hdmi-stereo>
        sinks:
                alsa_output.pci-0000_07_00.1.hdmi-stereo/#0: TU104 HD Audio Controller Digital Stereo (HDMI)
        sources:
                alsa_output.pci-0000_07_00.1.hdmi-stereo.monitor/#1: Monitor of TU104 HD Audio Controller Digital Stereo (HDMI)
        ports:
                hdmi-output-0: HDMI / DisplayPort (priority 5900, latency offset 0 usec, available: yes)
                        properties:
                                device.icon_name = "video-display"
                                device.product.name = "ASUS VP247
  "
                hdmi-output-1: HDMI / DisplayPort 2 (priority 5800, latency offset 0 usec, available: yes)
                        properties:
                                device.icon_name = "video-display"
                                device.product.name = "ASUS VP247
  "
                hdmi-output-2: HDMI / DisplayPort 3 (priority 5700, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-3: HDMI / DisplayPort 4 (priority 5600, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-4: HDMI / DisplayPort 5 (priority 5500, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-5: HDMI / DisplayPort 6 (priority 5400, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-6: HDMI / DisplayPort 7 (priority 5300, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
    index: 2
        name: <alsa_card.pci-0000_09_00.3>
        driver: <module-alsa-card.c>
        owner module: 8
        properties:
                alsa.card = "1"
                alsa.card_name = "HD-Audio Generic"
                alsa.long_card_name = "HD-Audio Generic at 0xf6700000 irq 102"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:09:00.3"
                sysfs.path = "/devices/pci0000:00/0000:00:08.1/0000:09:00.3/sound/card1"
                device.bus = "pci"
                device.vendor.id = "1022"
                device.vendor.name = "Advanced Micro Devices, Inc. [AMD]"
                device.product.id = "1457"
                device.product.name = "Family 17h (Models 00h-0fh) HD Audio Controller"
                device.string = "1"
                device.description = "Family 17h (Models 00h-0fh) HD Audio Controller"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        profiles:
                input:analog-stereo: Analog Stereo Input (priority 65, available: no)
                output:analog-stereo: Analog Stereo Output (priority 6500, available: unknown)
                output:analog-stereo+input:analog-stereo: Analog Stereo Duplex (priority 6565, available: no)
                output:iec958-stereo: Digital Stereo (IEC958) Output (priority 5500, available: unknown)
                output:iec958-stereo+input:analog-stereo: Digital Stereo (IEC958) Output + Analog Stereo Input (priority 5565, available: no)
                off: Off (priority 0, available: unknown)
        active profile: <output:analog-stereo>
        sinks:
                alsa_output.pci-0000_09_00.3.analog-stereo/#1: Family 17h (Models 00h-0fh) HD Audio Controller Analog Stereo
        sources:
                alsa_output.pci-0000_09_00.3.analog-stereo.monitor/#2: Monitor of Family 17h (Models 00h-0fh) HD Audio Controller Analog Stereo
        ports:
                analog-input-front-mic: Front Microphone (priority 8500, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "audio-input-microphone"
                analog-input-rear-mic: Rear Microphone (priority 8200, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "audio-input-microphone"
                analog-input-linein: Line In (priority 8100, latency offset 0 usec, available: no)
                        properties:

                analog-output-lineout: Line Out (priority 9000, latency offset 0 usec, available: no)
                        properties:

                analog-output-headphones: Headphones (priority 9900, latency offset 0 usec, available: yes)
                        properties:
                                device.icon_name = "audio-headphones"
                iec958-stereo-output: Digital Output (S/PDIF) (priority 0, latency offset 0 usec, available: unknown)
                        properties:

    index: 6
        name: <alsa_card.usb-046d_0825_8D1EA6E0-02>
        driver: <module-alsa-card.c>
        owner module: 38
        properties:
                alsa.card = "2"
                alsa.card_name = "USB Device 0x46d:0x825"
                alsa.long_card_name = "USB Device 0x46d:0x825 at usb-0000:02:00.0-7, high speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:02:00.0-usb-0:7:1.2"
                sysfs.path = "/devices/pci0000:00/0000:00:01.3/0000:02:00.0/usb1/1-7/1-7:1.2/sound/card2"
                udev.id = "usb-046d_0825_8D1EA6E0-02"
                device.bus = "usb"
                device.vendor.id = "046d"
                device.vendor.name = "Logitech, Inc."
                device.product.id = "0825"
                device.product.name = "Webcam C270"
                device.serial = "046d_0825_8D1EA6E0"
                device.form_factor = "webcam"
                device.string = "2"
                device.description = "Webcam C270"
                module-udev-detect.discovered = "1"
                device.icon_name = "camera-web-usb"
        profiles:
                input:mono-fallback: Mono Input (priority 1, available: unknown)
                input:multichannel-input: Multichannel Input (priority 1, available: unknown)
                off: Off (priority 0, available: unknown)
        active profile: <input:mono-fallback>
        sources:
                alsa_input.usb-046d_0825_8D1EA6E0-02.mono-fallback/#6: Webcam C270 Mono
        ports:
                analog-input-mic: Microphone (priority 8700, latency offset 0 usec, available: unknown)
                        properties:
                                device.icon_name = "audio-input-microphone"
                multichannel-input: Multichannel Input (priority 0, latency offset 0 usec, available: unknown)
                        properties:

[jr@fm ~]$ 
[jr@fm ~]$ inxi -Fazy
System:
  Kernel: 5.8.11-1-MANJARO x86_64 bits: 64 compiler: N/A 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.8-x86_64 
  root=UUID=1e8aecd0-e0c4-4dd2-8320-8a8dd8df66c6 rw quiet apparmor=1 
  security=apparmor udev.log_priority=3 
  Desktop: KDE Plasma 5.19.5 tk: Qt 5.15.1 wm: kwin_x11 dm: SDDM 
  Distro: Manjaro Linux 
Machine:
  Type: Desktop Mobo: ASUSTeK model: TUF B450M-PLUS GAMING v: Rev X.0x 
  serial: <filter> UEFI: American Megatrends v: 1002 date: 03/07/2019 
CPU:
  Topology: 8-Core model: AMD Ryzen 7 2700X bits: 64 type: MT MCP arch: Zen+ 
  family: 17 (23) model-id: 8 stepping: 2 microcode: 800820D 
  L2 cache: 4096 KiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm 
  bogomips: 118208 
  Speed: 1797 MHz min/max: 2200/3700 MHz boost: enabled Core speeds (MHz): 
  1: 1968 2: 1855 3: 1945 4: 2371 5: 2190 6: 2195 7: 2195 8: 2196 9: 1806 
  10: 3118 11: 2195 12: 2195 13: 2201 14: 2195 15: 1831 16: 1931 
  Vulnerabilities: Type: itlb_multihit status: Not affected 
  Type: l1tf status: Not affected 
  Type: mds status: Not affected 
  Type: meltdown status: Not affected 
  Type: spec_store_bypass 
  mitigation: Speculative Store Bypass disabled via prctl and seccomp 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 mitigation: Full AMD retpoline, IBPB: conditional, STIBP: 
  disabled, RSB filling 
  Type: srbds status: Not affected 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: NVIDIA TU104 [GeForce RTX 2080] vendor: ASUSTeK driver: nvidia 
  v: 440.100 alternate: nouveau,nvidia_drm bus ID: 07:00.0 chip ID: 10de:1e82 
  Display: x11 server: X.Org 1.20.9 compositor: kwin_x11 driver: nvidia 
  display ID: :0 screens: 1 
  Screen-1: 0 s-res: 3840x1080 s-dpi: 93 s-size: 1049x292mm (41.3x11.5") 
  s-diag: 1089mm (42.9") 
  Monitor-1: HDMI-0 res: 1920x1080 hz: 60 dpi: 94 size: 521x293mm (20.5x11.5") 
  diag: 598mm (23.5") 
  Monitor-2: DP-0 res: 1920x1080 hz: 60 dpi: 94 size: 521x293mm (20.5x11.5") 
  diag: 598mm (23.5") 
  OpenGL: renderer: GeForce RTX 2080/PCIe/SSE2 v: 4.6.0 NVIDIA 440.100 
  direct render: Yes 
Audio:
  Device-1: NVIDIA TU104 HD Audio vendor: ASUSTeK driver: snd_hda_intel 
  v: kernel bus ID: 07:00.1 chip ID: 10de:10f8 
  Device-2: AMD Family 17h HD Audio vendor: ASUSTeK driver: snd_hda_intel 
  v: kernel bus ID: 09:00.3 chip ID: 1022:1457 
  Device-3: Logitech Webcam C270 type: USB driver: snd-usb-audio,uvcvideo 
  bus ID: 1-7:18 chip ID: 046d:0825 serial: <filter> 
  Sound Server: ALSA v: k5.8.11-1-MANJARO 
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: ASUSTeK driver: r8169 v: kernel port: f000 bus ID: 05:00.0 
  chip ID: 10ec:8168 
  IF: enp5s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
Drives:
  Local Storage: total: 1.38 TiB used: 156.38 GiB (11.1%) 
  SMART Message: Unable to run smartctl. Root privileges required. 
  ID-1: /dev/nvme0n1 vendor: Samsung model: SSD 970 EVO Plus 500GB 
  size: 465.76 GiB block size: physical: 512 B logical: 512 B speed: 31.6 Gb/s 
  lanes: 4 serial: <filter> rev: 1B2QEXM7 scheme: GPT 
  ID-2: /dev/sda type: USB vendor: SanDisk model: Cruzer Blade size: 14.59 GiB 
  block size: physical: 512 B logical: 512 B serial: <filter> rev: 1.00 
  scheme: MBR 
  SMART Message: Unknown USB bridge. Flash drive/Unsupported enclosure? 
  ID-3: /dev/sdc type: USB vendor: Seagate model: Expansion size: 931.51 GiB 
  block size: physical: 4096 B logical: 512 B serial: <filter> rev: 0707 
  scheme: MBR 
Partition:
  ID-1: / raw size: 111.62 GiB size: 109.37 GiB (97.98%) 
  used: 23.58 GiB (21.6%) fs: ext4 dev: /dev/nvme0n1p4 
Swap:
  Kernel: swappiness: 60 (default) cache pressure: 100 (default) 
  ID-1: swap-1 type: partition size: 69.20 GiB used: 0 KiB (0.0%) priority: -2 
  dev: /dev/nvme0n1p3 
Sensors:
  System Temperatures: cpu: 39.4 C mobo: N/A gpu: nvidia temp: 34 C 
  Fan Speeds (RPM): N/A gpu: nvidia fan: 20% 
Info:
  Processes: 340 Uptime: 1h 37m Memory: 62.81 GiB used: 11.50 GiB (18.3%) 
  Init: systemd v: 246 Compilers: gcc: N/A Packages: pacman: 1239 lib: 346 
  flatpak: 0 Shell: Bash v: 5.0.18 running in: konsole inxi: 3.1.05

Okay I rebooted into kernel 5.4, and it works fine. Will stick with that.