It seems here that submitting you urbs is failing with the ENOSPC(-28)
error. This according to the usb documentation means you are trying to
over commit the reserved bandwidth for periodic transfers likely due
to  the facet you are using usb1.1. Try using both jpeg plus bulk
transfers. Bulk transfers are not considered periodic transfers with
reserved bandwidth. Use the following command when inserting the river
module

# insmod ./sn9c20x.ko jpeg=1 bulk=1

On Wed, Mar 18, 2009 at 4:01 AM, [email protected] <[email protected]> wrote:
>
> Hi GWater,
>
> nothing happens loading the driver with the option jpeg=1.
> I repost the output of dmesg after trying to play the stream with
> mplayer
>
> 159.019736] Linux video capture interface: v2.00
> [  236.326861] usbcore: registered new interface driver sn9c20x
> [  236.327777] sn9c20x: SN9C20x USB 2.0 Webcam Driver v2009.01 loaded
> [  323.552113] usb 1-2: new full speed USB device using uhci_hcd and
> address 3
> [  323.751809] usb 1-2: configuration #1 chosen from 1 choice
> [  323.756894] sn9c20x: SN9C20X USB 2.0 Webcam - 0C45:6270 plugged-in.
> [  323.844584] sn9c20x: I2C slave 0x5d returned error during write to
> address 0xff
> [  324.014569] sn9c20x: Detected MT9V111 Sensor.
> [  324.023316] sn9c20x: Webcam device 0C45:6270 is now controlling
> video device /dev/video0
> [  324.163545] sn9c20x: Using yuv420 output format
> [  339.126064] sn9c20x: Using jpeg output format
> [  339.574674] sn9c20x: isoc_init() submit_urb 0 failed with error -28
> [  339.574698] sn9c20x: isoc_init() submit_urb 1 failed with error -28
> [  339.574702] sn9c20x: isoc_init() submit_urb 2 failed with error -28
> [  339.574706] sn9c20x: isoc_init() submit_urb 3 failed with error -28
> [  339.574709] sn9c20x: isoc_init() submit_urb 4 failed with error -28
> [  339.574713] sn9c20x: isoc_init() submit_urb 5 failed with error -28
> [  339.574716] sn9c20x: isoc_init() submit_urb 6 failed with error -28
> [  339.574720] sn9c20x: isoc_init() submit_urb 7 failed with error -28
> [  339.574723] sn9c20x: isoc_init() submit_urb 8 failed with error -28
> [  339.574727] sn9c20x: isoc_init() submit_urb 9 failed with error -28
> [  354.584521] sn9c20x: [E] Empty buffer queue.
>
> Any suggestion? I looked for the inf file, by I didn't find it on the
> windows driver. I opened the cam, but there wasn't the part numer on
> the cmos sensor. So I cannot say if it's really the MT9V111 model.
>
> Thanks. Bye
> Marco
>
>>
>> Try loading the module with:
>> # insmod sn9c20x.ko jpeg=1
>>
>> GWater
>>
>>  signature.asc
>> < 1KViewDownload
> >
>

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