On Wed, 28 Jul 2010, Sam Gentle wrote: > > For now, your best bet may be to force the built-in hub to connect at > > full speed instead of high speed. You can do this by writing the hub's > > port number to the "companion" file in the EHCI controller's sysfs > > directory. For example, in your "connect" log the hub was attached to > > port 6 on bus 1, so you could do: > > > > echo 6 >/sys/bus/usb/devices/usb1/../companion > > Hm. There are no files named companion anywhere in my /sys/bus/usb > tree. A post here from a year and a half ago suggests I might need to > disable CONFIG_USB_EHCI_ROOT_HUB_TT - is that it? No. You definitely want to leave that option enabled. The "companion" file isn't located under /sys/bus/usb. You should be able to find it under /sys/devices, but the path above should also point to it. (How can that be? Answer: /sys/usb/udev/devices/usb1 is a symbolic link pointing to a directory under /sys/devices.) 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
