> lsusb Bus Device ID Intel Corp. Integrated Rate Matching Hub Bus Device ID Intel Corp. This was not the case with earlier Kernels/Ubuntu installs, where the power on all USB ports was switched off. Ubuntu Dapper Beta Linux. USB Not Working in Ubuntu? USB ports, meanwhile, should be checked with your PC switched off, and Fix USB power issues in Linux.

> lsusb Bus Device ID Intel Corp. Integrated Rate Matching Hub Bus Device ID Intel Corp. The code in terminal is chmod /media/ (FOR DISABLE USB) chmod / media/ (FOR ENABLE USB) the above chmod is nothing but change mode which is. If your machine runs old kernel, you could issue echo suspend > /sys/bus/usb/ devices/X-X/power/level to force suspension of device. However. To turn off power on all USB ports of a hub, you may unbind the hub from wich causes all of the USB devices to disconect from system, at least on ubuntu. This was not the case with earlier Kernels/Ubuntu installs, where the power on all USB ports was switched off. Ubuntu Dapper Beta Linux. USB Not Working in Ubuntu? USB ports, meanwhile, should be checked with your PC switched off, and Fix USB power issues in Linux. You may be able to tell specific devices to turn off (and thus not draw power), Can I turn PC to sleep mode while boot was made from flash-drive with Ubuntu?. I also have a power strip that I like to use, which works with a USB controlled relais. In the present state it obviously does not power off my other. See Controlling a USB power supply (on/off) with linux, short version, for newer kernels "suspend" does not work anymore: echo "0". All of the previous answers talk about a USB suspend mechanism, i.e. a "logical power-off", they will never physically cut the VBUS +5V from.