On Mon, May 16, 2016 at 03:49:55PM -0700, Brian T. McKee wrote: > Thanks Greg. It is a powered USB hub. The supplies have 2.5 amps to > spread across three cameras. One of the hub's ports uses laptop power, > but I'm not using that port. > The USB 3.0 spec (according to wikipedia) requires that each port be > capable of delivering 900 mA, so those power supplies seem a bit low > (needs 200mA more). But I strongly doubt the cameras are pulling 900mA > since they also work with USB 2.0 ports which specifies a much smaller > current. I can measure it if I play with a soldering iron, but I'd > rather not risk damaging a camera. USB hubs suck rocks, I would strongly recommend getting another one that you "know" will provide enough power to your devices. I've worked with enough different ones to know that if there is a chance the power drain can be exceeded, it will be. good luck! greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
