Created attachment 304822 [details] Dump from alsactl and alsaucm Motherboard is an "MSI MAG B650 TOMAHAWK WIFI AM5 AMD B650". This is the audio device that has an issue: https://linux-hardware.org/?id=usb:0db0-422d&hwid=ead3b1f0f0e8 From lsusb, the USB Id is: 0db0:422d Micro Star International USB Audio After updating the UCM files for ALSA, the mic now provides a signal. However, the volume is low, even at everything turned to maximum volume. I was able to pass-through the device to Windows 10 running in Qemu. After installing the "Realtek Audio Console", I see there is a "Microphone Boost" control under the mic settings. It has positions 0, +10 dB, +20 dB, +30 dB. Setting it to +20 dB solved the mic signal issue (software-based amplification of the signal, inside the chip?). My guess, without being too familiar with ALSA is that this board might need an entry in sound/usb/mixer_maps.c to specify which control is for the "Mic Boost". The chip seems to be an ALC4080. Some info on the chip here: https://www.igorslab.de/en/the-old-alc4080-on-the-new-intel-boards-demystified-and-the-differences-from-alc1220-insider/ I found this datasheet, but it is for a different model? It does mention a "mic boost" feature but I don't see how you set that. http://realtek.info/pdf/ALC888_1-0.pdf
I tried compiling the v6.5-rc5 Linux kernel but that doesn't help. I'm not surprised since there doesn't seem to be any relevant changes in the sound/* tree. I found a work-around for the lack of mic boost. With pipewire, it seems you can set a volume property that will increase the gain of the mic signal. I'm not sure what the downside of this would be but at least I can use applications that expect a larger mic input signal. ################################################ #!/bin/sh set -e # This is the node.description for the mic name='USB Audio Microphone' # Default value is 1.0. volume=15 # Lookup id of node for mic id=$(pw-dump -N| \ jq --arg n "$name" \ '..|objects|select(.["node.description"]==$n)|.["object.id"]') # Set volume property pw-cli set-param $id Props "{ volume: $volume }" ################################################