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-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
