See Controlling a USB power supply (on/off) with linux, short version, for newer kernels 'suspend' does not work anymore: echo '0' > '/sys/bus/usb/devices/usbX/power/autosuspend_delay_ms'Д®cho 'auto' > '/sys/bus/usb/devices/usbX/power/control'Д«ut it doesn't literally cut the power: it signals the device to poweroff, and it's up to the device to implement power management and do the right thing. Is there an alternative way of getting this information?ДЄlternatively, is there a way to shut off power to the entire usb subsystem? Something like modprobe -r usb_etc? Which prevents me from using this method to get the '2-1.1' part to this: echo '2-1.1' > /sys/bus/usb/drivers/usb/unbind Which does turn off power to the usb-hub device.Д«ut the output of lsusb -t just hangs: $lsusb -t The second solution: sudo bash -c 'echo 0 > /sys/bus/usb/devices/usb6/power/autosuspend_delay_ms echo auto > /sys/bus/usb/devices/usb6/power/control' $sudo bash -c 'echo suspend> /sys/bus/usb/devices/usb6/power/level'bash: line 0: echo: write error: Invalid argument Tee: /sys/bus/usb/devices/usb6/power/level: Invalid argument

$echo suspend|sudo tee /sys/bus/usb/devices/usb6/power/level suspend

Two solutions are here, the first suggests: echo disabled > /sys/bus/usb/devices/usb1/power/wakeupД®cho suspend > /sys/bus/usb/devices/usb1/power/level # turn offД«ut I get write error: Invalid argument when trying to write to /sys/bus/usb/devices/usb1/power/level: $sudo bash -c 'echo disabled > /sys/bus/usb/devices/usb6/power/wakeup' The lamp is connected to one of the ports in this hub: #myhost$ lsusbД«us 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubД«us 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubД«us 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubД«us 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubД«us 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubД«us 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubД«us 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubД«us 008 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubД«us 008 Device 006: ID 050d:0234 Belkin Components F5U234 USB 2.0 4-Port Hub I have a usb lamp which I specifically bought in order to turn it off programmatically at a certain time, thus I need to remove the power to its usb port.

Turn off usb power when computer off