14.255907] snd_hda_codec: module verification failed: signature and/or  
required key missing - tainting kernel
[   14.256203] snd_hda_codec: Unknown symbol snd_device_disconnect (err 0)

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https://bugs.launchpad.net/bugs/1414706

Title:
  [20ALCTO1WW, Realtek ALC292, Black Mic, Left][Lenovo ThinkPad X240]
  external mic has no sound at all

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