Some devices like USB modem get stuck when it failed to connect and just hang up forever when trying to dial a number. The solution is unplug and plug it again, weird but it works. But seriously, that is not "a geek way". Rather than plug/unplug we could do it via shell to send the device "on" or "off" signal.
Recognizing the USB Devices
These steps is used to get information about device that we want to send the signal to. A Tool used for this task islsusb. Here's example of output in my system, make to sure run as root.
$ lsusb Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 04f2:b290 Chicony Electronics Co., Ltd Bus 001 Device 009: ID 0cf3:3005 Atheros Communications, Inc. AR3011 Bluetooth Bus 002 Device 018: ID 201e:1022 <-- WE WANT TO SEND SIGNAL TO THIS DEVICE Bus 002 Device 016: ID 03f0:ae07 Hewlett-Packard Bus 002 Device 012: ID 0458:00ee KYE Systems Corp. (Mouse Systems)
