Have you tried starting cheese using LD_PRELOAD to make sure libv4l is
getting loaded?

I don't actually think thats needed in jaunty since interpid had the
gstreamer libraries linked against libv4l and i don't think that has
changed in jaunty but it shouldn't hurt either.

If you have done that and it does not help try loading the driver
module with the following

# insmod ./sn9c20x.ko log_level=15

This should turn on full debugging output. After starting cheese your
dmesg log should contain a bunch more infromation regarding what the
driver is trying to do.



On Thu, Apr 30, 2009 at 7:44 PM, vubuntu <[email protected]> wrote:
>
> Hiya,
>
> My webcam has failed to work since I upgrade to Ubuntu 9.04 (kernel
> 2.6.28-11). I did everything again from scratch and now only Mplayer
> detects and shows webcam images. Cheese shows neither "No wecam" nor
> "With webcam". Please note it worked with the previous kernel.
>
> I attach this log below. Please tell me what has gone wrong. Thanks.
>
> ==========
> [  102.704748] wlan0: associated
> [  131.591060] input: Virtual ThinkFinger Keyboard as /devices/virtual/
> input/input11
> [  167.475342] sn9c20x: Unknown symbol video_ioctl2
> [  167.475713] sn9c20x: Unknown symbol v4l_compat_ioctl32
> [  167.476532] sn9c20x: Unknown symbol video_devdata
> [  167.477506] sn9c20x: Unknown symbol video_unregister_device
> [  167.477786] sn9c20x: Unknown symbol video_device_alloc
> [  167.477930] sn9c20x: Unknown symbol video_register_device
> [  167.478658] sn9c20x: Unknown symbol video_device_release
> [  225.442564] Linux video capture interface: v2.00
> [  297.829522] sn9c20x: SN9C20X USB 2.0 Webcam - 0C45:624F plugged-in.
> [  297.938092] sn9c20x: Detected OV9650 Sensor.
> [  297.938193] sn9c20x: Webcam device 0C45:624F is now controlling
> video device /dev/video0
> [  297.938333] input: SN9C20X Webcam as /devices/pci0000:00/0000:00:1d.
> 7/usb1/1-4/input/input12
> [  297.977557] sn9c20x: Using yuv420 output format
> [  297.977619] usbcore: registered new interface driver sn9c20x
> [  297.977625] sn9c20x: SN9C20x USB 2.0 Webcam Driver v2009.01 loaded
> [  318.843281] sn9c20x: No ack from I2C slave 0x30 for write to
> address 0x2d
> [  333.752319] sn9c20x: [E] Empty buffer queue.
> [  370.740312] sn9c20x: [E] Empty buffer queue.
> [  382.085121] sn9c20x: Using yuv420 output format
> r...@vietkhoa-laptop:/home/vietkhoa/microdia# cheese
> r...@vietkhoa-laptop:/home/vietkhoa/microdia# cheese --verbose
> Cheese 2.26.0
> Probing devices with HAL...
> Found device 0c45:624f, getting capabilities...
> Detected v4l2 device: SN9C20x USB 2.0 Webcam Driver
> Driver: sn9c20x, version: 2099457
> Capabilities: 0x05000001
>
> Probing supported video formats...
> Device: SN9C20x USB 2.0 Webcam Driver (/dev/video0)
>
> r...@vietkhoa-laptop:/home/vietkhoa/microdia#
> =================
>
> >
>

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