So I have a problem that happens with 1-2 weeks interval in that the
xhci driver confuses itself and thinks that the usb bus is overused or
something.
The thing is that this is an external usb 2 hub with 7 ports and all 7
is used for different devices. I do a suspend/resume once a day and
thats it.
its the same devices on the hub but the USB driver for some reason
decides that it no longer can allow the devices on the bus.
1. is there any way to reset the entire usb stack without rebooting?? I
run 3.16 ubuntu kernel and I think usb is built in I at least can see
any module named xhci.
2. what can be done to solve this ?? there must be some type of resource
leak here as a reboot solves the problem and I have exactly the same usb
devices that I use.
3. I also notice that we max out at about 30 devices and I think usb
should be able to handle 127.
4. I noticed on a different computer that a usb sound card (5.1) was
also getting the bandwidth error if I attached it to a usb3 hub that had
only that device, it works if I remove the hub.
5. overall usb3 looks to be a bit "unpredictable" and if you google for
this type of errors the advice is to downgrade to usb2. that do sound
like the wrong thing to do unless the xhci hardware is that broken. is
it ? or is this the driver that needs fixing.
-----------------
[65633.315419] usb 3-1.4.1: Product: USB Transfer Cable
[65633.315422] usb 3-1.4.1: Manufacturer: Prolific Technology Inc.
[65633.315607] xhci_hcd 0000:00:14.0: Not enough bandwidth on HS bus for
newly activated TT.
[65633.315612] xhci_hcd 0000:00:14.0: Not enough bandwidth
[65633.315619] usb 3-1.4.1: can't set config #1, error -12
---
[65653.367865] xhci_hcd 0000:00:14.0: Not enough bandwidth on HS bus for
newly activated TT.
[65653.367867] xhci_hcd 0000:00:14.0: Not enough bandwidth
[65653.367872] usb 3-1.2: can't set config #1, error -12
and so on.
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