I can't get the webcam working. It used to be just to plug it in and it worked. I think it was with Debian Squeese. After upgrade to very latest Debian Stable (wheezy?) it refuses top work.

I have tried to follow docs on how to set up udev rules. And tried to create /dev/video0 manually.

When plugged in the webcam shows up as /dev/usbdevx.x.

Hi,
You can get some more info using udevadm tool. Before connecting the device, run udevadm --monitor(This tool should be available by default or else please install this package). This will capture useful logs. Also please see the output of dmesg and verify if the driver is properly getting registered.
BTW, how are you trying to access the webcam? If you are using an user space application and just trying to do open, read,write,ioctl etc then ensure that you are opening with proper name as /dev/usbdevx.x and not with what you are trying to create as /dev/video0 manually.

I try to access the webcam pretty much as I did with the earlier Deb. distributions. Plug in the webcam in an empty usb slot and start some webcam app, cheese or guvcview.

cheese expect the webcam to be at /dev/video0 and say no device found. And with no device found there is no way to edit any settings in cheese. Guvcviev say "Guvcview error: Unable to open device" and dies.

I am sure the drivers are correctly loaded. Can it be the webcam apps no longer works with the new device handling? If I plug in / unplug some usb devices the the device might change.

udevadm say that i connect an usb sound card

KERNEL[5341.422264] add /devices/pci0000:00/0000:00:13.5/usb1/1-6 (usb)
KERNEL[5341.423280] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.0 (usb)
KERNEL[5341.423363] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.1 (usb)
KERNEL[5341.423382] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2 (usb)
KERNEL[5341.629131] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1 (sound)
KERNEL[5341.629262] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1/pcmC1D0c (sound)
KERNEL[5341.629334] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1/controlC1 (sound)
KERNEL[5341.629391] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.3 (usb)
KERNEL[5341.629475] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/usb_device/usbdev1.12 (usb_device)
UDEV [5341.636484] add /devices/pci0000:00/0000:00:13.5/usb1/1-6 (usb)
UDEV [5341.639960] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/usb_device/usbdev1.12 (usb_device)
UDEV [5341.646040] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.3 (usb)
UDEV [5341.646741] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.0 (usb)
UDEV [5341.649611] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.1 (usb)
UDEV [5341.651466] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2 (usb)
UDEV [5341.652464] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1 (sound)
KERNEL[5341.653961] change /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1 (sound)
UDEV [5341.655637] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1/pcmC1D0c (sound)
UDEV [5341.665123] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1/controlC1 (sound)
UDEV [5341.666475] change /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1 (sound)

I try to access the webcam pretty much as I did with the earlier Deb. distributions. Plug in the webcam in an empty usb slot and start some webcam app, cheese or guvcview.

cheese expect the webcam to be at /dev/video0 and say no device found. And with no device found there is no way to edit any settings in cheese. Guvcviev say "Guvcview error: Unable to open device" and dies.

I am sure the drivers are correctly loaded. Can it be the webcam apps no longer works with the new device handling? If I plug in / unplug some usb devices the the device name might change.

udevadm say that i connect an usb sound card

KERNEL[5341.422264] add /devices/pci0000:00/0000:00:13.5/usb1/1-6 (usb)
KERNEL[5341.423280] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.0 (usb)
KERNEL[5341.423363] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.1 (usb)
KERNEL[5341.423382] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2 (usb)
KERNEL[5341.629131] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1 (sound)
KERNEL[5341.629262] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1/pcmC1D0c (sound)
KERNEL[5341.629334] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1/controlC1 (sound)
KERNEL[5341.629391] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.3 (usb)
KERNEL[5341.629475] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/usb_device/usbdev1.12 (usb_device)
UDEV [5341.636484] add /devices/pci0000:00/0000:00:13.5/usb1/1-6 (usb)
UDEV [5341.639960] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/usb_device/usbdev1.12 (usb_device)
UDEV [5341.646040] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.3 (usb)
UDEV [5341.646741] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.0 (usb)
UDEV [5341.649611] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.1 (usb)
UDEV [5341.651466] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2 (usb)
UDEV [5341.652464] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1 (sound)
KERNEL[5341.653961] change /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1 (sound)
UDEV [5341.655637] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1/pcmC1D0c (sound)
UDEV [5341.665123] add /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1/controlC1 (sound)
UDEV [5341.666475] change /devices/pci0000:00/0000:00:13.5/usb1/1-6/1-6:1.2/sound/card1 (sound)

how about advising the make and model of cam?

2) show all of

show snippet of /var/log/messages for your cam pls

The computer had Debian stable installed sometimes this summer. This weekend I tried to install Ubuntu Studio and it bailed out with an internal error inside the partitioning part of the install and left me with a blank disk.

Now I am back wit the latest Debian stable. This time it works out-of-the-box.

Thank you for taking you time!
Seven09

great to hear

pls mark this post as solved

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