Thanks for the help!

Elimar Riesebieter wrote:
In your case it would be more sensefull to create:
# echo "snd-usb-audio" > /etc/hotplug/blacklist.d/snd-usb-audio

In fact I'm using an "options snd-usb-audio index=-2" in a separate /etc/modprobe.d/sound (not replaced when updating alsa), so that I can use the microphone of my webcam.

to prevent loading the module via udev. Please notice that users have
usb-soundcards which are installed via /etc/modprobe.d/alsa-base:

install snd-usb-usx2y /sbin/modprobe --ignore-install snd-usb-usx2y \
$CMDLINE_OPTS && /lib/alsa/modprobe-post-install snd-usb-usx2y

An entry options snd-usb-audio index=-2 would be counterproductive in
that case ;)

Yeah, I understand it... :)

I was just thinking that as many people may also have an usb webcam/microphone, there should be a way of making the right choice automatically. In any case, you would prefer your integrated sound card be considered as the default if it exists.

I thought index=-2 was enough (ie if only one usb card existed, it would be considered as the default one), but you're right: index is interpreted as a bitmask and this wouldn't work. I don't see any other option to make it choice automatic. :(

This bug should certainly be closed, but I will surely report a feature request upstream to make it happen automatically (maybe the the way the default card is chosen should be handled differently?).

Thanks!
--
Steph


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