USB microphone passthrough: recognized, but does not work

[odonnell]

Hi guys, got a head scratcher here. Got a USB microphone, specifically this one from Amazon. Want to use it on my Windows 10 VM in Proxmox, but there is no input signal at all coming from it. I am passing through with the mapping shown below. ProxMox has no issue seeing it.


In Windows, it again shows up and is identified correctly. But no matter what I do, there is no sound input at all.



Other troubleshooting info:

• It works fine on other computers, even a Power Mac G5 running Mac OS X Leopard
• Up until buying this microphone, I was using an older USB microphone and it worked perfectly fine in the same VM. Zero issues at all passing it through.

Feels like something stupid. There aren't really any options or flags for passing through a USB device, so I'm not sure what is configured incorrectly?

Here is the VM config:

agent: 1
bios: ovmf
boot: order=scsi0;ide0;net0
cores: 10
cpu: host,flags=-md-clear
efidisk0: R620:vm-107-disk-1,efitype=4m,ms-cert=2023k,pre-enrolled-keys=1,size=1M
hostpci0: mapping=RTX3050,pcie=1,x-vga=1
ide0: none,media=cdrom
machine: pc-q35-9.2+pve1
memory: 32768
meta: creation-qemu=9.2.0,ctime=1754708820
name: Win10-LTSC
net0: virtio=BC:24:11:1C:F0:2C,bridge=vmbr1,firewall=1
numa: 1
ostype: win10
scsi0: R620:vm-107-disk-0,cache=writeback,iothread=1,size=500G
scsihw: virtio-scsi-single
smbios1: uuid=f011bdd8-54b7-4d0c-981f-6c347d780dc8
sockets: 2
usb0: mapping=Microphone
usb1: host=1-1.5
vga: none
vmgenid: ef66cea5-97d0-4a34-addf-cd683b125c85

Thanks in advance for any help!

 

[odonnell]

bump

 

[dcsapak]

hi,

this is probably not easy to debug, but one thing that could help is to try the microphone with a linux guest (if it works at all on linux). If it also does not work there the journal from the host and the guest might be helpful to see what might go wrong here.

you're right that there is not much to configure for usb passhtrough, because there aren't many options in qemu itself for that

the journal from the host might be interesting regardless