Hi all,

I am trying to write a script to turn a USB port on and off... I am using the USB port to power a device that needs to be occassionally reset, so the idea is to cut power off the USB and then back on. How do I do that with Shell programming? Furthermore, I have many USB ports on my computer, how do I know which port I am controlling?

I've been doing some searching in the linux file system, and found this file /sys/bus/usb/devices/usb1/power/state which seem like it says whether a USB port is on or off. The problem is I know for sure that there is at least one USB port that is on, yet all the power/state files have the value 0, does that mean the power is "on" on all the devices?

Thanks,
Neked

I do not think one can turn the power off on the USB port unless the hardware has the capability. Best place is to contact the vendor of the hardware and get the specs on the device. Normally 0 means off and 1 would mean on. But not sure how the usb modules are designed there. Best place to start there is check the readme files on the kernel to find the developers on the USB modules and contact them for there input.

Brian1