From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from perceval.ideasonboard.com ([95.142.166.194]:60455 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754774AbaFIJYc (ORCPT ); Mon, 9 Jun 2014 05:24:32 -0400 From: Laurent Pinchart To: Johannes Berg Cc: linux-media@vger.kernel.org, linux-usb@vger.kernel.org, Mathias Nyman Subject: Re: non-working UVC device 058f:5608 Date: Mon, 09 Jun 2014 11:25:01 +0200 Message-ID: <17531102.o7hyOUhSH7@avalon> In-Reply-To: <1402299186.4148.3.camel@jlt4.sipsolutions.net> References: <1402177903.8442.9.camel@jlt4.sipsolutions.net> <1404177.cR0nfxENUh@avalon> <1402299186.4148.3.camel@jlt4.sipsolutions.net> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-media-owner@vger.kernel.org List-ID: Hi Johannes, On Monday 09 June 2014 09:33:06 Johannes Berg wrote: > Hi Laurent, > > Thanks for the quick reply! You're welcome. > > > 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. I would thus be tempted to classify this as an XHCI controller issue. linux- usb should be the right list to get help. I've CC'ed Mathias Nyman, the XHCI maintainer. Johannes, could you enable USB debugging in the linus/master kernel and provide a kernel log ? -- Regards, Laurent Pinchart