Hello there, this bug also affected me even though the Product model is a bit 
different.
My laptop model is Acer Swift 3 SF314-56G which also use Realtek ALC256 
(HDA-Intel - HDA Intel PCH)
I use the fresh install of Ubuntu 19.04 with 5.0.0-31-generic kernel version. 
Is there any solutions or steps I need to take to make the microphone works?
Both internal and external microphone is not working at all.

Thanks in advance!

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https://bugs.launchpad.net/bugs/1793410

Title:
  [Acer Swift SF315-52, Realtek ALC256, Mic, Internal] Internal
  microphone not working

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