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Old 02-07-2004, 09:48 AM   #1
Cesar Ocasio
LQ Newbie
Registered: Feb 2004
Location: Hampton, Virginia
Distribution: VectorLinux
Posts: 15

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Plugged webcam breaks sound i/o

Hi. I got my webcam working by downloading PWC, and recompiling my kernel. But now I have an annoying problem.

Everytime I plugged in my USB webcam (Logitech Quickcam Pro 4000) upon boot, I get an "sound i/o error" when I logged into X. But when I unplug my webcam and reboot, my sound hardware "i810_audio" (nForce) and "ymfpci" (Yamaha DS-XG PCI sound card) works fine.

It seems something in my webcam is interfering with my motherboard's built-in sound hardware. Is there something I can do to have my webcam and nForce i810_audio sound working at the same time?

I tried '/sbin/modprobe i810_audio', but nothing happened.

Here's the content of my /etc/modules.conf:

# == Network configuration ==
alias eth0 3c59x
alias eth1 nvnet

# == USB configuration ==
alias usb-interface usb-ohci
alias usb-controller usb-ohci
alias usb-controller1 ehci-hcd

# == Firewire configuration ==
alias ieee1394-controller ohci1394

# == ??? ==
alias char-major-195 nvidia
alias char-major-81 videodev

# == Webcam configuration ==
alias char-major-81-0 pwc
options pwc fps=20 mbufs=3 compression=0
post-install pwc /sbin/insmod --force -k /lib/modules/usb/pwcx.o >/dev/null 2>&1  || :

# == Sound configuration ==
alias sound-slot-0 i810_audio
alias sound-slot-1 ymfpci

post-install sound-slot-0 /bin/aumix-minimal -f /etc/.aumixrc -L >/dev/null 2>&1 || :
pre-remove sound-slot-0 /bin/aumix-minimal -f /etc/.aumixrc -S >/dev/null 2>&1 || :
post-install sound-slot-1 /bin/aumix-minimal -f /etc/.aumixrc -L >/dev/null 2>&1 || :
pre-remove sound-slot-1 /bin/aumix-minimal -f /etc/.aumixrc -S >/dev/null 2>&1 || :

alias sound-slot-2 pwc
post-install sound-slot-2 /bin/aumix-minimal -f /etc/.aumixrc -L >/dev/null 2>&1 || :
pre-remove sound-slot-2 /bin/aumix-minimal -f /etc/.aumixrc -S >/dev/null 2>&1 || :
alias sound-slot-3 pwc
post-install sound-slot-3 /bin/aumix-minimal -f /etc/.aumixrc -L >/dev/null 2>&1 || :
pre-remove sound-slot-3 /bin/aumix-minimal -f /etc/.aumixrc -S >/dev/null 2>&1 || :
alias sound-slot-4 pwc
post-install sound-slot-4 /bin/aumix-minimal -f /etc/.aumixrc -L >/dev/null 2>&1 || :
pre-remove sound-slot-4 /bin/aumix-minimal -f /etc/.aumixrc -S >/dev/null 2>&1 || :
alias sound-slot-5 pwc
post-install sound-slot-5 /bin/aumix-minimal -f /etc/.aumixrc -L >/dev/null 2>&1 || :
pre-remove sound-slot-5 /bin/aumix-minimal -f /etc/.aumixrc -S >/dev/null 2>&1 || :
alias sound-slot-6 pwc
post-install sound-slot-6 /bin/aumix-minimal -f /etc/.aumixrc -L >/dev/null 2>&1 || :
pre-remove sound-slot-6 /bin/aumix-minimal -f /etc/.aumixrc -S >/dev/null 2>&1 || :
Also, when booting up for new hardware, why does it detects and configures my webcam five times?

I'm running Fedora core 1, kernel 2.4.22-1.2115.nptlsmp
Old 02-08-2004, 12:16 AM   #2
Cesar Ocasio
LQ Newbie
Registered: Feb 2004
Location: Hampton, Virginia
Distribution: VectorLinux
Posts: 15

Original Poster
Rep: Reputation: 0
...OMG I almost complely solved my problem!!

After booting up Fedora Core (with my webcam unplugged) and run XMMS (for sound playback availability), I then pluged in my webcam do 'modprobe pwc' and 'modprobe pwcx', then run xawtv and my webcam WORKED along with my sound card's audio!!

But why does it do that?!? I don't want to unplug/plug my webcam everytime I boot up Fedora Core...

Last edited by Cesar Ocasio; 02-08-2004 at 12:20 AM.
Old 02-08-2004, 07:26 AM   #3
Registered: Apr 2002
Location: Wales MA.
Distribution: openSuSE 11.1
Posts: 409

Rep: Reputation: 32
Kudzu, detects the built in microphone as a new sound device, it disables your current sound to enable the new sound device.

Either disable kudzu, or plug and unplug the camera.
Old 10-13-2004, 05:38 PM   #4
LQ Newbie
Registered: Oct 2004
Posts: 4

Rep: Reputation: 0
I have recently installed Mandrake 10.0 on my computer which has an onborad sound card AC'97 82801EB and a QuickCam Pro 4000 of Logitech. If I start with the webcam connected then I can't play sound however if I execute alsaconf then it works fine. If I disconnect the webcam then the sound card works fine. I tested what happens and concluded that in case of connected webcam device files for the sound card are not created.

I would want to use the two in the same time

What can I do?

Thanks in advace


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