Re: sndio audio, OpenBSD 7.8, two computers. One stutters, other doesn't detect sound card.

On Mon, Mar 23, 2026 at 08:58:08PM +0100, Brian Durant wrote:
> Sooo, I started out by installing OpenBSD on the same computer as my Void Linux sndio system had been installed on. Unfortunately, the OpenBSD 7.8 system does not detect the sound card in dmesg. No mention at all. I hooked the usb sound card up to another computer, that I also installed OpenBSD 7.8 on. Here, it detects the sound card, but I get some stuttering from audio in the web browsers (firefox and chromium):
> 
> $ dmesg | grep UMC404HD
> uaudio0 at uhub0 port 5 configuration 1 interface 1 "BEHRINGER UMC404HD 192k" rev 2.00/1.35 addr 4
> umidi0 at uhub0 port 5 configuration 1 interface 4 "BEHRINGER UMC404HD 192k" rev 2.00/1.35 addr 4
> ugen0 at uhub0 port 5 configuration 1 "BEHRINGER UMC404HD 192k" rev 2.00/1.35 addr 4
> 
> 
> dmesg uaudio errors:
> 
> uaudio0: sync play xfer, err = 6
> uaudio0: sync play xfer, err = 6
> uaudio0: sync play xfer, err = 6

These are harmless

> 
> The computer previously with Void Linux, has some years ago had OpenBSD installed on it and sndio audio output worked with the same usb sound card. Not sure what is going on with the new 7.8 version and if it is directly related to sndio...
> 

On OpenBSD, there are usb host/hub/device combinations that don't work
well yet. Furthrmore, the usb stack runs at a low priority so it
stutters more than typical pci devices.

Could you share your dmesg output?