Re: USB audio stopped working between p7 and p8

From: Jonathan Vasquez <>
Date: Sun, 30 Jul 2023 14:09:38 UTC
Hey Alban,

You can also try loading snd_uaudio from /boot/loader.conf. I had to do that for my DragonFly Cobalt DAC (if I wanted it to be the default device directly upon a fresh start). Attempting to load it from /etc/rc.conf didn't give me the intended results.

Jonathan Vasquez
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-------- Original Message --------
On Jul 30, 2023, 07:13, Alban Hertroys wrote:

>> On 25 Jul 2023, at 13:19, Alban Hertroys  wrote: > > Hi list, > > I recently upgraded my home server with musicpd from 13.1-RELEASE-p7 to 13.1-RELEASE-p8, and now USB audio stopped working. (…) > For the upgrade, I used: > freebsd-update fetch > freebsd-update install > > Before the upgrade, the USB DAC registered as pcm0 while now it registers as pcm2, so the sysctl’s applied to the device now obviously go to another device (namely one of the HDMI outputs), but even then I should get audio from it. (…) I got this working again. I had entirely forgotten that I had a custom kernel in place (and also that freebsd-update updates the sources too, so that you can compile a custom kernel based on updated sources). That kernel conf contains this bit: # Sound support nodevice sound # Generic sound driver (required) nodevice snd_cmi # CMedia CMI8338/CMI8738 nodevice snd_csa # Crystal Semiconductor CS461x/428x nodevice snd_emu10kx # Creative SoundBlaster Live! and Audigy nodevice snd_es137x # Ensoniq AudioPCI ES137x nodevice snd_hda # Intel High Definition Audio nodevice snd_ich # Intel, NVidia and other ICH AC'97 Audio nodevice snd_via8233 # VIA VT8233x Audio That in turn causes only the necessary Audio subsystem kernel modules to be loaded, probably from the USB uaudio device detection: > kldstat Id Refs Address Size Name 1 66 0xffffffff80200000 1487e60 kernel (…) 7 1 0xffffffff82214000 6730 cuse.ko 8 1 0xffffffff8221b000 3378 acpi_wmi.ko 9 1 0xffffffff8221f000 3218 intpm.ko 10 1 0xffffffff82223000 2180 smbus.ko 11 1 0xffffffff82226000 2280 uhid.ko 12 1 0xffffffff82229000 3320 usbhid.ko 13 1 0xffffffff8222d000 31f8 hidbus.ko 14 1 0xffffffff82231000 32c0 wmt.ko 15 1 0xffffffff82235000 3268 ums.ko 16 1 0xffffffff82239000 c4d0 snd_uaudio.ko 17 2 0xffffffff82246000 43488 sound.ko (…) And now the only PCM device is: > cat /dev/sndstat Installed devices: pcm0:  (play) default No devices installed from userspace. And everything falls into place again. It’s still unclear to me why it didn’t work with sound and snd_hda included in the GENERIC kernel, or is it perhaps because uaudio isn’t in that kernel and instead gets loaded on demand after the other drivers? If so, was this the expected result? Regards, Alban Hertroys -- There is always an exception to always.