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Subject: Re: non-working UVC device 058f:5608
From: Johannes Berg <johannes@sipsolutions.net>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: linux-media@vger.kernel.org, linux-usb@vger.kernel.org
Date: Mon, 09 Jun 2014 09:33:06 +0200
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Hi Laurent,

Thanks for the quick reply!

> > and then the kernel message repeats forever, while I can't even exit
> > uvccapture unless I kill it hard, at which point I get
> > 
> > xhci_hcd 0000:00:14.0: Signal while waiting for configure endpoint command
> > usb 1-3.4.4.3: Not enough bandwidth for altsetting 0
> > 
> > from the kernel.
> 
> This looks like low-level USB issues, CC'ing the linux-usb mailing list.

Ok.

> > Any thoughts? Just to rule out hardware defects I connected it to my
> > windows 7 work machine and it works fine without even installing a
> > driver.
> 
> Could you try connecting it to an EHCI controller instead of XHCI on a Linux  
> machine ?

Indeed, that works! Interestingly, it works neither on a USB3 port
directly, nor on a USB2 hub behind the USB3 port.

Thanks,
johannes