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Date: Sat, 29 Jun 2013 15:20:13 -0400
From: Gary Palmer <gpalmer@freebsd.org>
To: Waitman Gobble <uzimac@da3m0n8t3r.com>
Subject: Re: usb sound module loading
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On Sat, Jun 29, 2013 at 12:03:20PM -0700, Waitman Gobble wrote:
> 
> Hi,
> 
> 
> I have sound modules commented out in kernel config :
> # Sound support
> #device         sound           # Generic sound driver (required)
> #device         snd_cmi         # CMedia CMI8338/CMI8738
> #device         snd_csa         # Crystal Semiconductor CS461x/428x
> #device         snd_emu10kx     # Creative SoundBlaster Live! and Audigy
> #device         snd_es137x      # Ensoniq AudioPCI ES137x
> #device         snd_hda         # Intel High Definition Audio
> #device         snd_ich         # Intel, NVidia and other ICH AC'97 Audio
> #device         snd_via8233     # VIA VT8233x Audio
> #device         snd_uaudio      # USB Audio
> 
> However, if i plug in a USB mic the following kernel modules are loaded
> automatically:
> 
> 8    1 0xffffffff81e44000 f344     snd_uaudio.ko
>  9    2 0xffffffff81e54000 3dfdf    sound.ko
> 
> I do not seem to have any sound related options active in /boot/loader.conf or
> /etc/rc.conf
> 
> This causes a problem when using ossv4.2 in ports, actually when a USB mic is
> plugged in ...
> (when using the oss v4.2 drivers, and you have them loaded into the kernel,
> ie
> 14    3 0xffffffff82086000 7b581    osscore.ko
> 15    1 0xffffffff81e44000 4360     oss_cmpci.ko
> 16    1 0xffffffff81e49000 214a0    oss_hdaudio.ko
>  ) 
> ... the machine instantly reboots. It would be good to either prevent sound.ko
> from loading, or have the machine use the oss4.2 driver instead.
> 
>  Any hints or suggestions appreciated.
> 
> Thanks,

Check /etc/devd/usb.conf

You don't mention which release you are using, but I suspect the USB
config file for devd is autoloading the snd_uaudio module for you.

Regards,

Gary