Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754554Ab2GACMK (ORCPT ); Sat, 30 Jun 2012 22:12:10 -0400 Received: from netrider.rowland.org ([192.131.102.5]:57732 "HELO netrider.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1754168Ab2GACMI (ORCPT ); Sat, 30 Jun 2012 22:12:08 -0400 Date: Sat, 30 Jun 2012 22:12:07 -0400 (EDT) From: Alan Stern X-X-Sender: stern@netrider.rowland.org To: Frederik Himpe cc: linux-kernel@vger.kernel.org, , Subject: Re: Logitech HD Webcam C525 does not work when connected to USB 2 port, works on USB 3 In-Reply-To: <1341084110.4862.15.camel@piranha.localdomain> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1175 Lines: 31 On Sat, 30 Jun 2012, Frederik Himpe wrote: > Hello, > > I've got a Logitech HD Webcam C525 using the uvcvideo module and I use > Linux 3.5 RC4. When this camera is connected to a USB2 port, it does not > work most of the time. However it does work fine when connected to a USB > 3 port. In Windows it works on both ports. ... > Complete dmesg and lsusb -v output about a failed attempt (on USB 2 > port) and a succeeded attempt (on USB 3) can be found on > http://artipc10.vub.ac.be/~frederik/webcam/ A usbmon trace would be more helpful. Or perhaps a pair of traces, one for the USB-2 port and one for the USB-3 port. See the instructions in Documentation/usb/usbmon.txt. Those disconnections in your dmesg logs are not normal. They could be caused by a hardware incompatibility or by a software problem -- although if it were software then I would expect the same thing to happen with the USB-3 port. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/