From: Alan Stern <stern@rowland.harvard.edu>
To: Frederik Himpe <fhimpe@telenet.be>
Cc: linux-kernel@vger.kernel.org,
<linux-uvc-devel@lists.sourceforge.net>,
<linux-usb@vger.kernel.org>
Subject: Re: Logitech HD Webcam C525 does not work when connected to USB 2 port, works on USB 3
Date: Sat, 30 Jun 2012 22:12:07 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1206302209270.6344-100000@netrider.rowland.org> (raw)
In-Reply-To: <1341084110.4862.15.camel@piranha.localdomain>
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
next prev parent reply other threads:[~2012-07-01 2:12 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-30 19:21 Logitech HD Webcam C525 does not work when connected to USB 2 port, works on USB 3 Frederik Himpe
2012-07-01 2:12 ` Alan Stern [this message]
2012-07-01 12:34 ` Frederik Himpe
2012-07-01 15:54 ` Alan Stern
2012-07-02 20:12 ` Frederik Himpe
2012-07-03 0:40 ` Alan Stern
2012-07-04 18:21 ` Frederik Himpe
2012-07-04 18:42 ` Alan Stern
2012-07-04 20:19 ` Frederik Himpe
2012-07-05 1:20 ` Alan Stern
2012-07-05 19:35 ` Frederik Himpe
2012-07-05 21:24 ` Alan Stern
2012-07-11 6:11 ` Heinz Diehl
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