How can I hard reset a USB device? [closed]

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Answer: 1

32 hours ago

I have a USB device (a modem) that is really finicky. Sometimes it works fine, but other times it refuses to connect. The only solution I have found to fix it once it gets into a bad state is to physically unplug the device and plug it back in. However, I don't always have physical access to the machine it is plugged in on, so I'm looking for a way to do this through the command line.

This post suggests running:

sudo modprobe -w -r usb_storage; sudo modprobe usb_storage

However I get an "unknown option -w" output. This slightly modified command:

sudo modprobe -r usb_storage

Fails with the message FATAL: Module usb_storage is in use. If I try to kill -9 the processes marked [usb-storage] before running they refuse to die (I think because they are deeply tied to the kernel).

Anyone know of a way to do this?

NOTE: I cross-posted this on superuser.com as I didn't know which was more appropriate. I will delete and/or link whichever one is answered first.

Added by: Jaden Ryan

Answer: 2

1 hours ago

Your modem driver might still be loaded. check with "sudo lsmod" which modules are using usb_storage or any other usb modules. You have to "sudo modprobe -r the other modules" first.

Added by: Mrs. Heather Dach

Answer: 3

10 hours ago

Try to close any relevant service and afterwards try to remove the dependencies first.

There is always the cruel way of rmmod but i don't suggest because it could crash your system

You could also make a script that disable usb power on such cases

Added by: Antwan Dibbert

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