Re: Big ptoblem with small webcam

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Hi,

On Wednesday 02 March 2011 16:57:05 W.P. wrote:
> Hi there,
> I just got an Creative VGA (640x480) USB Live Webcam, VF0520.
> 
> lsusb (partial):
> 
> Bus 003 Device 007: ID 041e:406c Creative Technology, Ltd
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               2.00
>   bDeviceClass          239 Miscellaneous Device
>   bDeviceSubClass         2 ?
>   bDeviceProtocol         1 Interface Association
>   bMaxPacketSize0        64
>   idVendor           0x041e Creative Technology, Ltd
>   idProduct          0x406c
>   bcdDevice           10.19
>   iManufacturer           1 Creative Labs
>   iProduct                3 VF0520 Live! Cam Sync
>   iSerial                 0
>   bNumConfigurations      1
> 
> lsmod | grep vid:
> uvcvideo               50184  0
> compat_ioctl32          5120  1 uvcvideo
> videodev               32000  1 uvcvideo
> v4l1_compat            15876  2 uvcvideo,videodev
> 
> uname -a (kernel from Fedora 10):
> [root@laurent-home ~]# uname -a
> Linux laurent-home 2.6.27.5-117.fc10.i686 #1 SMP Tue Nov 18 12:19:59 EST
> 2008 i686 athlon i386 GNU/Linux
> 
> Problem: device nodes are created, but NO video in gmplayer, tvtime
> complains: can't open /dev/video0.
> 
> Only trace in syslog is:
> 
> Mar  2 16:26:56 laurent-home kernel: uvcvideo: Failed to submit URB 0
> (-28).

This means the webcam requires more USB bandwidth than available. Another 
device probably uses USB bandwidth (it could be another webcam, an audio 
device, ...).

> Webcam is connected to VIA USB 2.0 controller through a USB 2.0 hub.
> 
> What is strange, two days ago I tried apparently the same (model VFxxxx)
> with SUCCESS.
> Device seems working in Windoze (Ekiga).
> 
> What should I check/ do?

-- 
Regards,

Laurent Pinchart
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