On 30/8/24 10:32 pm, Greg KH wrote:
On Fri, Aug 30, 2024 at 10:14:20PM +1000, Eyal Lebedinsky wrote:
I assume that the generated list is a tree, so each leaf (Device/If) is on only one point.
I note this output:
$ lsusb -tv
/: Bus 001.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/16p, 480M
ID 1d6b:0002 Linux Foundation 2.0 root hub
[trimmed]
|__ Port 004: Dev 004, If 0, Class=Hub, Driver=hub/4p, 480M
[trimmed]
|__ Port 005: Dev 006, If 0, Class=Hub, Driver=hub/4p, 480M
[trimmed]
|__ Port 006: Dev 019, If 0, Class=Hub, Driver=hub/4p, 480M
ID 2109:2817 VIA Labs, Inc.
/: Bus 002.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/10p, 10000M
[trimmed]
|__ Port 006: Dev 006, If 0, Class=Hub, Driver=hub/4p, 5000M
ID 2109:0817 VIA Labs, Inc.
I removed some content that is not relevant to my question.
Note the Bus 001.Port 006 and Bus 002.Port 006 entries.
I verified that both are for the same (one) device. They do not show when I disconnect it.
The device is an external 4-port USB3.0 hub. It is listed once as 480M and once as 5000M.
Nothing is plugged into any of the four ports.
Is this correct? Why does this device show twice in the list?
That's odd, as the same device shouldn't be on multiple busses. Busses
are a "root port" on the system (i.e. a new PCI controller device), so
are you sure you just don't have multiple devices with the same
device/vendor id?
What is the diff between running the command before and after removing a
single device?
I now attached a different 4-port usb3 hub (another brand: idVendor=2109, idProduct=0817)
and I see two devices detected (4 ports each) again, these are the new devices listed:
/: Bus 001.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/16p, 480M
...
|__ Port 006: Dev 023, If 0, Class=Hub, Driver=hub/4p, 480M
ID 0bda:5411 Realtek Semiconductor Corp. RTS5411 Hub
...
/: Bus 002.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/10p, 10000M
...
|__ Port 006: Dev 010, If 0, Class=Hub, Driver=hub/4p, 5000M
ID 0bda:0411 Realtek Semiconductor Corp. Hub
thanks,
greg k-h
--
Eyal at Home (eyal@xxxxxxxxxxxxxx)
