Ahh, good tip, I'll try it, and let you know the output. Thanks. On Tue, Dec 16, 2014 at 8:49 AM, Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> wrote: > 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
