Lenovo ThinkPad X1 Carbon 6th gen built-in microphone detected but not recording

I have a Lenovo ThinkPad X1 Carbon 6th gen and the built-in microphone is detected by alsa, pulse, and GNOME settings, but none of them receive any sound. The microphone worked a few kernel versions ago, however I can not remember which one as it has been a while since I have needed to use the microphone. Here is the output of some commands that may or may not be useful:

amixer -d

Simple mixer control 'Master',0
  Capabilities: pvolume pswitch pswitch-joined
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 65536
  Front Left: Playback 30806 [47%] [on]
  Front Right: Playback 30806 [47%] [on]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch cswitch-joined
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 65536
  Front Left: Capture 30421 [46%] [on]
  Front Right: Capture 30421 [46%] [on]

arecord -l

**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC285 Analog [ALC285 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

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