Hi On 16.12.2014 00:53, Gustavo Duarte wrote: > Hi Guys, > > > I'm having troubles for communication between a NXT - Lego Brick > device (http://www.lego.com/) and a Notebook with USB 3.0. > > kernel version: > > $ uname -r > 3.13.0-36-generic > $lspci -vvv > > 00:14.0 USB controller: Intel Corporation ValleyView USB xHCI Host > ************************************* > Questions > ************************************* > > 1) Do you think this issue could be caused by kernel/xhci_hcd module ? > It's possible Can you upgrade to a more recent kernel and see if it helps? There are a lot of xhci changes since 3.13. Current is 3.18 > 2) I know that without the brick device, replicate this tests for you > isn't possible. > > So i would like to ask you, a guide to debug this problem, what kind > of things I can do to try find out, the problem. > what does dmesg say? any xhci related errors? You can enable more verbose xhci debugging with: echo -n 'module xhci_hcd =p' > /sys/kernel/debug/dynamic_debug/control then start communicating with your device, and show the output of dmesg. Requires dynamic debug support and debugfs mounted, I think many distributions have them as default. -Mathias -- 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
