The comment #65 was what worked for me.
https://bugs.launchpad.net/ubuntu/+source/alsa-
driver/+bug/1840725/comments/65
My OS installation is Kubuntu 18.04.
Additional and more detailed info about my laptop:
```
$ uname -a
Linux ioku 5.3.0-59-generic #53~18.04.1-Ubuntu SMP Thu Jun 4 14:58:26 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
$ sudo dmidecode -t system
# dmidecode 3.1
Getting SMBIOS data from sysfs.
SMBIOS 3.1.1 present.
Handle 0x0012, DMI type 1, 27 bytes
System Information
Manufacturer: LENOVO
Product Name: 20QDCTO1WW
Version: ThinkPad X1 Carbon 7th
Serial Number: PF1E44X3
UUID: 06E257CC-238A-11B2-A85C-ECF7951B56CA
Wake-up Type: Power Switch
SKU Number: LENOVO_MT_20QD_BU_Think_FM_ThinkPad X1 Carbon 7th
Family: ThinkPad X1 Carbon 7th
Handle 0x0027, DMI type 12, 5 bytes
System Configuration Options
Handle 0x0037, DMI type 15, 31 bytes
System Event Log
Area Length: 1586 bytes
Header Start Offset: 0x0000
Header Length: 16 bytes
Data Start Offset: 0x0010
Access Method: General-purpose non-volatile data functions
Access Address: 0x00F0
Status: Valid, Not Full
Change Token: 0x00000062
Header Format: Type 1
Supported Log Type Descriptors: 4
Descriptor 1: POST error
Data Format 1: POST results bitmap
Descriptor 2: PCI system error
Data Format 2: None
Descriptor 3: System reconfigured
Data Format 3: None
Descriptor 4: Log area reset/cleared
Data Format 4: None
$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: sofsklhdacard [sof-skl_hda_card], device 0: HDA Analog (*) []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: sofsklhdacard [sof-skl_hda_card], device 1: HDA Digital (*) []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: sofsklhdacard [sof-skl_hda_card], device 6: DMIC32 (*) []
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: sofsklhdacard [sof-skl_hda_card], device 7: DMIC16 (*) []
Subdevices: 1/1
Subdevice #0: subdevice #0
```
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https://bugs.launchpad.net/bugs/1840725
Title:
Microphone not working in Ubuntu 18.04.3 LTS on new hp-
spectre-x360-convertible-15 laptop
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