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Add a note about USB 3.0 hubs duality and usage quirks

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Vadim Mikhailov
2018-02-15 18:23:05 -08:00
parent bccb920526
commit 41dadcea34
1 changed files with 12 additions and 0 deletions
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README.md
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@@ -56,6 +56,17 @@ WARNING: turning off built-in USB ports may cut off your keyboard or mouse,
so be careful what ports you are turning off!
USB 3.0 duality note
====================
If you have compatible USB 3.0 hub connected to USB3 upstream port,
it will be detected as 2 independent virtual hubs: USB2 and USB3, and your USB devices will be
connected to USB2 or USB3 virtual hub depending on their capabilities and connection speed.
To control power for such hubs, you may need to turn off/on power on **both** USB2 and USB3
virtual hubs for power off/on changes to take effect.
Unfortunately, while most hubs will cut off data USB connection, some may still not cut off VBUS to port,
which means connected phone may still continue to charge from port that is powered off by uhubctl.
Compiling
=========
@@ -101,6 +112,7 @@ On Linux, you may need to run it with `sudo`, or to configure `udev` USB permiss
If you have more than one smart USB hub connected, you should choose
specific hub to control using `-l` (location) parameter.
To find hub locations, simply run uhubctl without any parameters.
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