The microphone doesn't record anything on a fresh install

I recently installed manjaro with KDE on an Asus laptop, and the microphone doesn’t work. (Neither does Bluetooth, but that’s for another post.) It’s a built-in mic that works on Windows but not on Linux. It is detected thouth, but when I try recording with arecord it doesn’t show any activity – when I try to listen to what’s been recorded I only get low level white noise.
Here’s output from arecord -l:

    [user@hostname ~]$ arecord -l
    **** List of CAPTURE Hardware Devices ****
    card 1: PCH [HDA Intel PCH], device 0: ALC3236 Analog [ALC3236 Analog]
      Subdevices: 1/1
      Subdevice #0: subdevice #0

Output from pacmd list-sources

4 source(s) available.
    index: 0
        name: <alsa_input.hw_1_0>
        driver: <module-alsa-source.c>
        flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: SUSPENDED
        suspend cause: IDLE
        priority: 9030
        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 48000Hz
        channel map: front-left,front-right
                     Stereo
        used by: 0
        linked by: 0
        configured latency: 0.00 ms; range is 0.50 .. 2000.00 ms
        module: 5
        properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "ALC3236 Analog"
                alsa.id = "ALC3236 Analog"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "1"
                alsa.card_name = "HDA Intel PCH"
                alsa.long_card_name = "HDA Intel PCH at 0xf7a18000 irq 50"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:1b.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card1"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.vendor.name = "Intel Corporation"
                device.product.id = "9c20"
                device.product.name = "8 Series HD Audio Controller"
                device.form_factor = "internal"
                device.string = "hw:1,0"
                device.buffering.buffer_size = "384000"
                device.buffering.fragment_size = "192000"
                device.access_mode = "mmap+timer"
                device.description = "Built-in Audio"
                device.icon_name = "audio-input-microphone-pci"
    index: 1
        name: <combined.monitor>
        driver: <module-combine-sink.c>
        flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: SUSPENDED
        suspend cause: IDLE
        priority: 1000
        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 48000Hz
        channel map: front-left,front-right
                     Stereo
        used by: 0
        linked by: 0
        configured latency: 0.00 ms; range is 0.50 .. 200.00 ms
        monitor_of: 0
        module: 16
        properties:
                device.description = "Monitor Source of Simultaneous output to Built-in Audio Analog Stereo"
                device.class = "monitor"
                device.icon_name = "audio-input-microphone"
    index: 2
        name: <alsa_output.pci-0000_00_1b.0.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 48000Hz
        channel map: front-left,front-right
                     Stereo
        used by: 0
        linked by: 0
        configured latency: 0.00 ms; range is 0.50 .. 2000.00 ms
        monitor_of: 1
        card: 1 <alsa_card.pci-0000_00_1b.0>
        module: 28
        properties:
                device.description = "Monitor of Built-in Audio Analog Stereo"
                device.class = "monitor"
                alsa.card = "1"
                alsa.card_name = "HDA Intel PCH"
                alsa.long_card_name = "HDA Intel PCH at 0xf7a18000 irq 50"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:1b.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card1"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.vendor.name = "Intel Corporation"
                device.product.id = "9c20"
                device.product.name = "8 Series HD Audio Controller"
                device.form_factor = "internal"
                device.string = "1"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
  * index: 3
        name: <alsa_input.pci-0000_00_1b.0.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: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        base volume: 5206 /   8% / -66.00 dB
        volume steps: 65537
        muted: no
        current latency: 0.00 ms
        max rewind: 0 KiB
        sample spec: s16le 2ch 48000Hz
        channel map: front-left,front-right
                     Stereo
        used by: 0
        linked by: 0
        configured latency: 0.00 ms; range is 0.50 .. 2000.00 ms
        card: 1 <alsa_card.pci-0000_00_1b.0>
        module: 28
        properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "ALC3236 Analog"
                alsa.id = "ALC3236 Analog"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "1"
                alsa.card_name = "HDA Intel PCH"
                alsa.long_card_name = "HDA Intel PCH at 0xf7a18000 irq 50"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:1b.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card1"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.vendor.name = "Intel Corporation"
                device.product.id = "9c20"
                device.product.name = "8 Series HD Audio Controller"
                device.form_factor = "internal"
                device.string = "front:1"
                device.buffering.buffer_size = "384000"
                device.buffering.fragment_size = "192000"
                device.access_mode = "mmap+timer"
                device.profile.name = "analog-stereo"
                device.profile.description = "Analog Stereo"
                device.description = "Built-in Audio Analog Stereo"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        ports:
                analog-input-internal-mic: Internal Microphone (priority 8900, latency offset 0 usec, available: unknown)
                        properties:
                                device.icon_name = "audio-input-microphone"
                analog-input-mic: Microphone (priority 8700, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "audio-input-microphone"
        active port: <analog-input-internal-mic>

Output from
$ dmesg | grep snd:

[   28.640245] snd_hda_codec_realtek hdaudioC1D0: autoconfig for ALC3236: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker
[   28.640248] snd_hda_codec_realtek hdaudioC1D0:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[   28.640250] snd_hda_codec_realtek hdaudioC1D0:    hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
[   28.640252] snd_hda_codec_realtek hdaudioC1D0:    mono: mono_out=0x0
[   28.640253] snd_hda_codec_realtek hdaudioC1D0:    inputs:
[   28.640255] snd_hda_codec_realtek hdaudioC1D0:      Internal Mic=0x1a
[   28.640257] snd_hda_codec_realtek hdaudioC1D0:      Mic=0x19
[   29.494599] snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])

Output from
inxi -Fazy:

System:
  Kernel: 5.10.2-2-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 
  parameters: BOOT_IMAGE=/vmlinuz-5.10-x86_64 root=/dev/mapper/vg0-root ro 
  cryptdevice=UUID=c273662c-17fe-4fed-a414-c4da2ce6fbf3:cryptlvm rw quiet 
  udev.log_priority=3 
  resume=/dev/disk/by-uuid/616b7481-c262-4d11-b277-da306deb5c10 
  Desktop: KDE Plasma 5.20.4 tk: Qt 5.15.2 wm: kwin_x11 dm: SDDM 
  Distro: Manjaro Linux 
Machine:
  Type: Laptop System: ASUSTeK product: X550LN v: 1.0 serial: <filter> 
  Mobo: ASUSTeK model: X550LN v: 1.0 serial: <filter> 
  UEFI: American Megatrends v: X550LN.306 date: 06/26/2014 
Battery:
  ID-1: BAT0 charge: 3.7 Wh condition: 3.9/38.5 Wh (10%) volts: 14.8/14.8 
  model: ASUSTeK X550A26 type: Li-ion serial: N/A status: Not charging 
  cycles: 164 
CPU:
  Info: Dual Core model: Intel Core i5-4200U bits: 64 type: MT MCP 
  arch: Haswell family: 6 model-id: 45 (69) stepping: 1 microcode: 26 
  L2 cache: 3 MiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 18366 
  Speed: 1596 MHz min/max: 800/2600 MHz Core speeds (MHz): 1: 1596 2: 1596 
  3: 1596 4: 1597 
  Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled 
  Type: l1tf 
  mitigation: PTE Inversion; VMX: conditional cache flushes, SMT vulnerable 
  Type: mds mitigation: Clear CPU buffers; SMT vulnerable 
  Type: meltdown mitigation: PTI 
  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 generic retpoline, IBPB: conditional, 
  IBRS_FW, STIBP: conditional, RSB filling 
  Type: srbds mitigation: Microcode 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: Intel Haswell-ULT Integrated Graphics vendor: ASUSTeK driver: i915 
  v: kernel bus ID: 00:02.0 chip ID: 8086:0a16 
  Device-2: NVIDIA GM108M [GeForce 840M] vendor: ASUSTeK driver: nouveau 
  v: kernel bus ID: 04:00.0 chip ID: 10de:1341 
  Device-3: Chicony USB2.0 HD UVC WebCam type: USB driver: uvcvideo 
  bus ID: 2-5:2 chip ID: 04f2:b40a serial: <filter> 
  Display: x11 server: X.Org 1.20.10 compositor: kwin_x11 
  driver: intel,nouveau unloaded: modesetting alternate: fbdev,nv,vesa 
  display ID: :0 screens: 1 
  Screen-1: 0 s-res: 1366x768 s-dpi: 96 s-size: 361x203mm (14.2x8.0") 
  s-diag: 414mm (16.3") 
  Monitor-1: eDP1 res: 1366x768 hz: 60 dpi: 99 size: 350x190mm (13.8x7.5") 
  diag: 398mm (15.7") 
  OpenGL: renderer: Mesa DRI Intel HD Graphics 4400 (HSW GT2) 
  v: 4.5 Mesa 20.3.1 compat-v: 3.0 direct render: Yes 
Audio:
  Device-1: Intel Haswell-ULT HD Audio vendor: ASUSTeK driver: snd_hda_intel 
  v: kernel bus ID: 00:03.0 chip ID: 8086:0a0c 
  Device-2: Intel 8 Series HD Audio vendor: ASUSTeK driver: snd_hda_intel 
  v: kernel bus ID: 00:1b.0 chip ID: 8086:9c20 
  Sound Server: ALSA v: k5.10.2-2-MANJARO 
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: ASUSTeK driver: r8169 v: kernel port: e000 bus ID: 02:00.1 
  chip ID: 10ec:8168 
  IF: enp2s0f1 state: down mac: <filter> 
  Device-2: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter 
  vendor: AzureWave driver: ath9k v: kernel port: e000 bus ID: 03:00.0 
  chip ID: 168c:0036 
  IF: wlp3s0 state: up mac: <filter> 
Drives:
  Local Storage: total: 465.76 GiB used: 26.46 GiB (5.7%) 
  SMART Message: Unable to run smartctl. Root privileges required. 
  ID-1: /dev/sda maj-min: 8:0 vendor: Toshiba model: MQ01ABF050 
  size: 465.76 GiB block size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s 
  serial: <filter> rev: 1J 
Partition:
  ID-1: / raw size: 32 GiB size: 31.25 GiB (97.65%) used: 14.68 GiB (47.0%) 
  fs: ext4 dev: /dev/dm-1 maj-min: 254:1 mapped: vg0-root 
  ID-2: /boot raw size: 388 MiB size: 367.7 MiB (94.77%) used: 161 MiB (43.8%) 
  fs: ext4 dev: /dev/sda2 maj-min: 8:2 
  ID-3: /boot/efi raw size: 100 MiB size: 96 MiB (96.00%) 
  used: 43.4 MiB (45.2%) fs: vfat dev: /dev/sda1 maj-min: 8:1 
  ID-4: /home raw size: 277.64 GiB size: 272.28 GiB (98.07%) 
  used: 11.57 GiB (4.3%) fs: ext4 dev: /dev/dm-3 maj-min: 254:3 
  mapped: vg0-home 
Swap:
  Kernel: swappiness: 60 (default) cache pressure: 100 (default) 
  ID-1: swap-1 type: partition size: 16 GiB used: 0 KiB (0.0%) priority: -2 
  dev: /dev/dm-2 maj-min: 254:2 mapped: vg0-swap 
Sensors:
  System Temperatures: cpu: 42.0 C mobo: N/A 
  Fan Speeds (RPM): cpu: 2100 
Info:
  Processes: 186 Uptime: 2h 18m wakeups: 1 Memory: 7.66 GiB 
  used: 1.33 GiB (17.4%) Init: systemd v: 247 Compilers: gcc: 10.2.0 
  clang: 11.0.0 Packages: pacman: 1677 lib: 428 flatpak: 0 Shell: Bash 
  v: 5.1.0 running in: konsole inxi: 3.2.01 

I’ve been struggling with this for three days now and I don’t know what to do. I’ve been reading post here on the forum, as well as Arch Wiki, and nothing seems to work! Appreciate any help.

Have you tried installing sof-firmware? I had a similar problem (with different hardware though) and that did the trick for me

Yes. I found this advice somewhere on this forum. Didn’t help.

Another detail. I managed to pair and connect my headset to this laptop. The sound output works fine – I can hear music in my headset when I play something. But the microphone on the headset doesn’t record anything – just like the built-in mic. And yes, I did change the headset profile to HSP/HFP in the PulseAudio control – no effect!
This makes me suspect that the issue is deeper than I first thought. Has anybody been able to get their microphone to work?