In other words: We don't have enough information to support this hw
(speakers). If vendor is not willing to add support to BIOS or give us
necessary information to add the proper initialization for the I2C
amplifiers to the driver, the only way is the reverse engineering (grab
the initialization HDA verbs in qemu or so). The another problem is that
the I2C master block in the Realtek codecs is not documented. Those
registers are hidden as the vendor specific coefficient registers.

For the mic volume - you may try to play with PGA / Dmic volume controls
in the native ALSA mixer application (like alsamixer). But it should
work with latest pulseaudio / UCM configuration.

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https://bugs.launchpad.net/bugs/1845797

Title:
  Microphone not detected Lenovo Yoga S940

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