Comment 45 for bug 1845797

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.