Correction: recent kernels > 2.6 do not have ..../power/level --> use .../power/control
Or something like: echo 1.4 /sys/bus/usb/drivers/usb/unbind -T On Mon, Jan 22, 2024, 15:42 Tomas Kuchta <tomas.kuchta.li...@gmail.com> wrote: > While not answering your question - this may solve your problem... > > You can cut power to usb device by something like this: > > echo suspend > /sys/bus/usb/devices/usb1/power/level > > That way, you could just make sure that nothing draws power regardless of > plugged in or not. It could save you from unplugging stuff manually based > on some message. > > Hope it helps, > Tomas > > On Mon, Jan 22, 2024, 15:12 Vince Winter <thine.technoc...@gmail.com> > wrote: > >> We are running power testing and we need to make sure their isn't USB >> device plugged in it adds to the total system power by having the USB port >> activate. >> >> I am trying to do a automated is USB plugged. >> >> We are using multiple generations of systems that are regularly >> reinstalled. >> >> >> On Mon, Jan 22, 2024, 9:42 AM Russell Senior <russ...@personaltelco.net> >> wrote: >> >> > I don't quite understand. You are looking for a specific device? How do >> you >> > identify the device? >> > >> > On Mon, Jan 22, 2024 at 9:35 AM Vince Winter < >> thine.technoc...@gmail.com> >> > wrote: >> > >> > > I need if USB device is plugged to not to continue the rest of the >> script >> > > across multiple devices. I can't change every device and I am trying >> to >> > > eliminate humans looking at which devices are plugged in. >> > > >> > > I do conceded that many laptop cameras are USB and Bluetooth generally >> > runs >> > > on the USB bus. >> > > >> > > I have yet to find a good answer to this myself. >> > > >> > > On Fri, Jan 19, 2024, 3:54 PM Russell Senior < >> russ...@personaltelco.net> >> > > wrote: >> > > >> > > > Two things I will mention: lsusb and udev rules. >> > > > >> > > > I have a set of udev rules that match ttyusb devices by path (they >> > don't >> > > > implement serial numbers, which would be better) and give them a >> > > > consistently named symlink. I use /dev/ttyRn, where n is a whole >> > number. >> > > > That means no matter what order they are enumerated in, I can find >> the >> > > > device. >> > > > >> > > > I don't know if that helps with your problem or not, but I have >> found >> > > them >> > > > to be useful in adjacent problems. >> > > > >> > > > -- >> > > > Russell >> > > > >> > > > On Fri, Jan 19, 2024, 15:17 Vince Winter < >> thine.technoc...@gmail.com> >> > > > wrote: >> > > > >> > > > > Hello, >> > > > > >> > > > > I am trying to write a bash script to detect if USB device is >> plugged >> > > > into >> > > > > a device and post a message with a device name that is plugged to >> > > stdout. >> > > > > >> > > > > Complications are USB webcams, USB controllers, and this is going >> to >> > be >> > > > > used on large number of systems, so I can't customize to each >> system. >> > > > > >> > > > >> > > >> > >> >
