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I have a USB-powered light. This light is just an LED and resistor between the +5V and GND pins on the USB connector.

I would like to plug this light into my computer, and be able to turn it on/off from the command line. Is this achievable? (Ubuntu 22.04)

Jordan
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    Does this answer your question? Turning off power to usb port. Or turn off power to entire usb subsystem – Marcus Müller May 29 '23 at 22:02
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    Note that the takeaway is: You in all likelihood cannot turn off the power to your USB port. Your USB light is "too stupid", if you say it's just a resistor and an LED, and mainboards "hardwire" 5V to the USB connectors. If it was an actual USB device, i.e. a microcontroller that "speaks" the USB protocol, shutting down the device might be possible, if the software on that microcontroller supports it. – Marcus Müller May 29 '23 at 22:04
  • If your motherboard doesn't support powering off a USB port, you can buy USB hubs that will do this. They implement PPPS Per-Port Power Switching, for software control. There are very few around, see the list given by uhubctl in link above by Marcus. The uugear hub still seems to be sold, for about 35euro. – meuh May 30 '23 at 09:41

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