USB2 mode is significantly less power delivery capability. However, a HUB which is powered by the Jetson must therefore take in total among all connected devices no more than a single max current draw on the root_hub…the power regulator won’t magically provide full USB3 current to all devices. If using USB3 mode on root_hub, then more power should be available than if USB2 mode is shown. This also determines which standard is used for power delivery on the port. When a HUB connects to the host as USB3 mode (verify with root_hub as “5000M” under “lsusb -t”) this establishes the maximum speed the host can provide for everything downstream (so if “lsusb -t” shows root_hub as “480M”, then only USB2 mode could be used for everything even if “5000M” is the specification…it would do this if the connected device is not visible as having USB3 mode). One area to know a bit about is how USB HUBs are designed… There are a lot of little things which can go wrong. if you pull-out usb-hub, re plugin-in it, it not work.plug-in/pull-out mouse or keyboard, it works well, no over-current occured.pull out usb-hub, plug-in mouse directly to usb port, it not work.plug-in mouse or keyboard, it not work, over-current occured.

plug-in usb hub, the usb-hub indicator light is on.

I have apply the follow patch to enable usb: - a/kernel-dts/t18x-common-platforms/tegra186-quill-power-tree-p3310-1000-a00-00.dtsi I have tried it on R27.1 on TX2, it is ok, but failed on R28.1.

The BSP version is R28.1, the last kernel commit id is af6c53b9060c2b4a4bda8215ea3cba0d94b5610f.

Multi tt usb 3.0 hub