On Thu, May 19, 2022 at 09:55:54AM +0300, Anssi Saari wrote: > Jason <elect...@emypeople.net> writes: > > > What is the best way to power cycle or reset a USB port? I need to do > > this to reset a USB modem if it stops responding. The system in > > question is Debian 10 aarch64 on RockPi 4b+. > > As far as I know, power cycling is not usually a function of USB.
Oh, it is. Cutting power to "misbehaving" USB gadgets is even part of the spec, so a compliant port has to have the hardware for that. Inconveniencing my favourite search engine (guess which one *not*) yields a couple of hits: https://stackoverflow.com/questions/4702216/controlling-a-usb-power-supply-on-off-with-linux https://unix.stackexchange.com/questions/165447/turning-off-power-to-usb-port-or-turn-off-power-to-entire-usb-subsystem/321945#321945 http://blog.andrew.net.au/2009/01/17 https://superuser.com/questions/524391/how-can-i-power-cycle-a-usb-device-on-raspberry-pi So depending on your hardware, drivers, kernel version and possibly moon phase, you might be lucky :) Happy poking -- t
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