Radek,
Please attach the full dmesg output when starting video capture with
the second camera.
Also increase log verbosity first:

something like this:
rmmod uvcvideo
modprobe uvcvideo trace=65535

You should also refer your capture settings (if I remember MJPG
640x480@24 fps) and that if you use one c910 and one c600 everything
works fine.

Note: Cc linux-media since you also posted this thread there.

Regards,
Paulo

2011/1/14 Radek Mašín <ra...@masin.eu>:
> Hello,
> I'm trying to get working two Logitech C910 cameras in one computer and I'm 
> unable to
> do it. I connect both cameras to one USB controller and first camera is 
> starting capture
> without problem, but when I try to start second camera during first camera is 
> running,
> I get message in log "uvcvideo: Failed to submit URB 0" and capturing fails.
> I have discussed this problem on quickcamteam forum and it seems, that there 
> is problem
> with uvcvideo driver for this camera.
> Cameras have been tested in two different systems (SuSe 11.2 and Ubuntu 
> 10.10) and on
> both systems I get same behavior.
>
> Thank you
> Radek Masin
> _______________________________________________
> Linux-uvc-devel mailing list
> linux-uvc-de...@lists.berlios.de
> https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
>
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