On Mon, 30 Jan 2012, Ross Ryles wrote: > On Mon, Jan 30, 2012 at 3:16 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > Ross, can > > you run a kernel with CONFIG_USB_DEBUG enabled? �Then when the hang > > occurs, go into /sys/kernel/debug/usb/ohci/0000:00:02.0 and post copies > > of the files in there. > > I guess those files won't be persistent across a reboot? Not only are they not persistent across a reboot, they change from moment to moment! They contain descriptions of the current state of the controller hardware and the driver's data structures. > If not it > cold be difficult to get copies of them after the system hangs. I'll > have a go when I get home in about 3 hours. I thought only ftdi_sio and the program using it was hanging -- not your entire system. You could copy the debugging files from a separate window or even using an ssh connection. 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
