On Friday 06 July 2007 14:16, Tom Horsley wrote: > Here's some behavior I've never seen before: > > https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=247224 > > My motherboard's CK804 audio system utterly vanishes > if I have the webcam plugged in at boot time :-). > > Doesn't have anything to do with the highly alpha uvcvideo > driver I was playing with because I found it fails > even if the uvcvideo driver isn't installed. Apparently > it is something about the USB microphone component of > the webcam that gets linux confused at boot time. > > Anyone ever seen a USB device hide a non-USB device like > this? I've had problems before with my usb midi keyboard which uses snd-usb-audio. often I've had to set options to load it as card 1, otherwise it gets loaded as card0, and the soundcard is loaded as card1. I don't know about your problem specifically, but would you post the output from. cat /proc/asound/cards First do this booting up with the webcam unplugged, then shutdown, plugin the webcam, reboot, and run cat /proc/asound/cards again. It will be interesting to see if, when the webcam is plugged in, it is being detected as card0. ( that is, the usb mike part of it), and your sound card is being set as card1. Can you also post the output of /sbin/lsusb with the webcam plugged in, and also the output from /sbin/lsmod. Nigel.