Re: Debugging USB 3.0 Speeds

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Am Dienstag, den 05.09.2017, 13:52 -0700 schrieb Shaya Potter:
> I've added a USB 3.0 card that should support super speed to a server I 
> have, but it's not working at super-speed speeds for the external hard 
> drives I connect, and a having a hard time diagnosing why (hardware 
> issue/quirk?  driver issue?)
> 
> Before installing the card, xhci wasn't ever used, now it is, so that 
> makes it clear that it is a usb 3.0 card.  It's a 4 port card, but what's 
> weird is that the card seems to expose 2 USB hubs with 4 ports.

It should do so. XHCI always provides two virtual controllers as the
concept of companion controllers for lower speeds has been abandoned.

> I have tested these drives in other computers (windows) and they seemed to 
> work at super-speed speeds, plan is to try a different usb 3.0 card as 
> well in this machine which I also know worked in windows at super-speed 
> speeds, but trying to understand f there are other ways to debug it.
> 
> i.e. even lsusb -v shows that these devices should be capable of 
> super-speed speeds

This is an issue with the XHCI driver. Please switch on dynamic debugging
for it.

	Regards
		Oliver

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