Please test this kernel, no need to add any temp fix.

https://people.canonical.com/~hwang4/lp1930188/

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https://bugs.launchpad.net/bugs/1930188

Title:
  Acer Aspire 5 sound driver issues

Status in linux package in Ubuntu:
  New

Bug description:
  Hello,

  There seems to be lots of issues in sound driver for Acer Aspire
  A515-56-57XR with ALC255. I will list all of them below and what I
  have tried so far.

  1. Headphones appears always plugged in even if they are physically not
  2. When actually plugging in headset/earphones it does not auto switch from 
speakers/internal mic to headphones/headset microphone automatically and vice 
versa, have to manually switch everytime.
  3. External headset/earphones microphone won't work at all

  After, logs of trial and error I have found a temporary fix. This
  seems to use legacy intel drivers which solves all 3 issues mentioned
  above but the internal/dmic mic is completely gone (which seems
  intentional when using this). Both depreciated dmic_detect and
  dsp_driver works, I have been using dsp_driver for now as I need
  external microphone at any cost.

  End of /etc/modprobe.d/alsa-base.conf
  # Headset mic fix
  options snd-hda-intel dmic_detect=0 / options snd-intel-dspcfg dsp_driver=1
  options snd-hda-intel model=alc255-acer

  In another thread similar to this I got some support and at least
  fixed the external microphone without using the alsa-base.conf change
  in custom modified kernel. I will attach it here. Now, hoping to fix
  other issues as well slowly like making headphones unplugged when
  physically removing as well as auto switching like the legacy driver
  one.

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