[Realtek ALC257][Lenovo T14 Gen1] Internal mic or headset mic not detected

[Julien Lafont]

Hello,

I've received a brand new Lenovo T14 Gen 1 (Intel), that suffers of some incompatibilities with Ubuntu.

The internal mic is not detected (only analog input is displayed). And when a headset is plug, only the output works.

I've tried lots of alsa-base.conf snd-hda-intel overrides without success.
Tested on U18 and U20.

> uname -a
Linux julien-ThinkPad-T14-Gen-1 5.9.0-050900-generic #202010112230 SMP Sun Oct 11 22:34:01 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
(tried with stock kernel and kernel-oem too)

> arecord -l
**** Liste des Périphériques Matériels CAPTURE ****
carte 0: PCH [HDA Intel PCH], périphérique 0: ALC257 Analog [ALC257 Analog]
  Sous-périphériques: 1/1
  Sous-périphérique #0: subdevice #0
carte 0: PCH [HDA Intel PCH], périphérique 2: ALC257 Alt Analog [ALC257 Alt Analog]
  Sous-périphériques: 2/2
  Sous-périphérique #0: subdevice #0
  Sous-périphérique #1: subdevice #1

> cat /proc/asound/card0/codec\#0
https://gist.github.com/julienlafont-tabmo/4ba9311bbb1d3d918532279d7578ba28

> hdajackretask (default configuration)
 - Internal speaker Ox14
 - Black headphone, Right Side, 0x21
 - All others: not connected

> alsa-info
http://alsa-project.org/db/?f=a5af631628bef97a85cace2574b7c6694037130a

> alba-base.conf settings tried without success:

options snd-hda-intel model=laptop-dmic
--
options snd-hda-intel dmic_detect=0
options snd-hda-intel index=0 model=laptop-dmic
--
options snd-hda-intel dmic_detect=0
options snd-hda-intel index=1 model=laptop-dmic
--
options snd-hda-intel model=auto
--
options snd-hda-intel model=headset-mic

Do you have some idea to make the mic working?

Bests,

[Hui Wang (hui.wang)]

We just enabled the mic for this machine under 20.04.

Please run 'sudo apt dist-upgrade' then reboot, please use ubuntu kernel, if it doesn't work, please upload the log of 'painfo > painfo.txt'.

[Julien Lafont (yotsumi)]

After further investigations, the problem could come from the computer itself.

I finished my distro / kernel tests with a windows installation, and I discovered that the mic is still unavailable...

Sorry for the inconvenience, I think you can close this ticket. I am going to bring in the on-site support to fix the problem on window, before going further on the linux side.

[Julien Lafont (yotsumi)]

Confirmed to be an hardware problem... Sorry for the inconveninence.

[Hui Wang (hui.wang)]

OK, set it to invalid.

thx.