On 01/06/14 10:41, Huang Wen Hui wrote:
% grep xhci dmesg-xhci-debug.txt | more
xhci0: <Intel Lynx Point USB 3.0 controller> mem 0xc1e00000-0xc1e0ffff at
device 20.0 on pci0
xhci0: attempting to allocate 1 MSI vectors (8 supported)
xhci0: using IRQ 266 for MSI
xhci0: MSI enabled

Those USB timeouts are most likely due to port routing not working properly. It is because intel did something special to their lynx point series.

Try to set :

hw.usb.xhci.xhci_port_route = "-1"

in /boot/loader.conf

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