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@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
