Re: unexpected webcam side effect



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.





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