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Date: Sun, 01 Jul 2012 14:34:50 +0200 From: Frederik Himpe <fhimpe@...enet.be> To: Alan Stern <stern@...land.harvard.edu> Cc: linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org Subject: Re: Logitech HD Webcam C525 does not work when connected to USB 2 port, works on USB 3 On Sat, 2012-06-30 at 22:12 -0400, Alan Stern wrote: > 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. OK, I created a usbmon trace both from the USB-2 port as the USB-3 port. During the trace, I connected the USB webcam to the USB port and started mplayer, which failed on USB-2 but worked fine on USB-3. The two traces can be found here: http://artipc10.vub.ac.be/~frederik/webcam/ Thanks! -- Frederik Himpe <fhimpe@...enet.be> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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