Same issue her with an Acer VN7-572G:
Card: HDA Intel PCH
F1: │ Chip: Realtek ALC255
lspci | grep -I audio
00:1f.3 Multimedia audio controller: Intel Corporation Sunrise Point-LP HD
Audio (rev 21)
cat /proc/asound/cards
0 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0xa4320000 irq 135
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https://bugs.launchpad.net/bugs/1523100
Title:
Alsa not detecting internal microphone [ALC255] (Realtek)
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