RPI4 hubs

[esiqveland]

Hi, thank you for this great tool!

When running uhubctl -l 1-1 -a 0 on my rpi4 it looks like it disables all hubs:

$ cat usbreset.sh
#!/bin/bash

sudo uhubctl -l 1-1 -a 0 

sleep 2

sudo uhubctl -l 1-1 -a 1

$ sudo bash usbreset.sh 
Current status for hub 2 [1d6b:0003 Linux 5.10.25-5-ARCH xhci-hcd xHCI Host Controller 0000:01:00.0, USB 3.00, 4 ports, ppps]
  Port 1: 02a0 power 5gbps Rx.Detect
  Port 2: 0203 power 5gbps U0 enable connect [152d:0567 USB 3.0 Device USB 3.0 Device 000000004685]
  Port 3: 02a0 power 5gbps Rx.Detect
  Port 4: 02a0 power 5gbps Rx.Detect
Sent power off request
New status for hub 2 [1d6b:0003 Linux 5.10.25-5-ARCH xhci-hcd xHCI Host Controller 0000:01:00.0, USB 3.00, 4 ports, ppps]
  Port 1: 0080 off
  Port 2: 0080 off
  Port 3: 0080 off
  Port 4: 0080 off

Current status for hub 1-1 [2109:3431 USB2.0 Hub, USB 2.10, 4 ports, ppps]
  Port 1: 0100 power
  Port 2: 0503 power highspeed enable connect []
  Port 3: 0100 power
  Port 4: 0100 power
Sent power off request
New status for hub 1-1 [2109:3431 USB2.0 Hub, USB 2.10, 4 ports, ppps]
  Port 1: 0000 off
  Port 2: 0000 off
  Port 3: 0000 off
  Port 4: 0000 off

Current status for hub 2 [1d6b:0003 Linux 5.10.25-5-ARCH xhci-hcd xHCI Host Controller 0000:01:00.0, USB 3.00, 4 ports, ppps]
  Port 1: 0080 off
  Port 2: 0080 off
  Port 3: 0080 off
  Port 4: 0080 off
Sent power on request
New status for hub 2 [1d6b:0003 Linux 5.10.25-5-ARCH xhci-hcd xHCI Host Controller 0000:01:00.0, USB 3.00, 4 ports, ppps]
  Port 1: 02a0 power 5gbps Rx.Detect
  Port 2: 02a0 power 5gbps Rx.Detect
  Port 3: 02a0 power 5gbps Rx.Detect
  Port 4: 02a0 power 5gbps Rx.Detect

Current status for hub 1-1 [2109:3431 USB2.0 Hub, USB 2.10, 4 ports, ppps]
  Port 1: 0000 off
  Port 2: 0000 off
  Port 3: 0000 off
  Port 4: 0000 off
Sent power on request
New status for hub 1-1 [2109:3431 USB2.0 Hub, USB 2.10, 4 ports, ppps]
  Port 1: 0100 power
  Port 2: 0100 power
  Port 3: 0101 power connect []
  Port 4: 0100 power

I found it a bit surprising that it would disable all hubs, not just hub located at 1-1. Is this expected? Might also mention this in the RPI4 section then.

I know it says Raspberry Pi turns power off on all ports, not just the one I specified but should this be all ports on all hubs ?

[mvp]

Hubs 1-1 and 2 are physically the same hub, this is how USB3 duality works.
Each USB3 device is presenting itself as 2 seemingly independent devices (1-1 is USB2, and 2 is USB3). uhubctl knows about this and when you ask it to turn power off, it would automatically power off on both virtual hubs. Without this, power off would not work.
You can use option -e to disable this behavior.