I'm having the same issue on my Lenovo T480s. I am able to use the mic on my bluetooth headset. However, the internal mic doesn't even show up as an Input Device in the pulse audio mixer.
uname -a
Linux chaos 5.3.0-28-generic #30~18.04.1-Ubuntu SMP Fri Jan 17 06:14:09 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC257 Analog [ALC257 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
I'm having the same issue on my Lenovo T480s. I am able to use the mic on my bluetooth headset. However, the internal mic doesn't even show up as an Input Device in the pulse audio mixer.
uname -a
Linux chaos 5.3.0-28-generic #30~18.04.1-Ubuntu SMP Fri Jan 17 06:14:09 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC257 Analog [ALC257 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0