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| author | Vadim Mikhailov <mvp@users.noreply.github.com> | 2018-02-15 18:23:05 -0800 |
|---|---|---|
| committer | Vadim Mikhailov <mvp@users.noreply.github.com> | 2018-02-15 18:30:19 -0800 |
| commit | 41dadcea341fac243deabca1c5899e085fcb7ad5 (patch) | |
| tree | 6773559324ea05bcddcba5cad836282ccd72d6b8 | |
| parent | bccb9205265c6a9ca021d7cc4877060869716297 (diff) | |
Add a note about USB 3.0 hubs duality and usage quirks
| -rw-r--r-- | README.md | 12 |
1 files changed, 12 insertions, 0 deletions
@@ -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. Copyright |