On 12/17/2010 07:42 AM, Alan Stern wrote:
Anyway, you can force individual root-hub ports to be dedicated to the companion controller by using sysfs. For example, let's say you wanted port 4 on bus 1 always to run at full or low speed. You would do it by: # echo 4>/sys/bus/usb/devices/usb1/../companion
Ok the problem is that in earlier versions of the kernel this was something like:
/sys/class/usb_host/usb_hostXXX/companion
There is no equivalent operation for ports on a USB hub. The best you can do is force the entire hub to run at full speed.
Is this a "limitation" of the USB stack implementation in Linux or something "inherent" in the USB protocol?
This basically prevents "forcing" a device to full-speed in case I am using an external hub.
You can also force the entire high-speed bus over to the companion, by
Thank you for all the interesting information :) bye! as -- 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
