Re: [LAU] USB audio interface and a buggy USB controller

Excerpts from david's message of 2010-09-15 19:32:44 +0200:
> Monty Montgomery wrote:
> > Oh, I should say I've also just recently seen similar problems (for no
> > apparent reason) when an XHCI (3.0) controller hands off a full-speed
> > (1.1) isochronous device. Is the port this is being plugged into a
> > USB 3.0 port ('SuperSpeed')?
>
> Someone said something earlier about hubs. I have a USB2 hub plugged
> into a USB2 port on my laptop. When I tried using a Behringer UCA-202
> (USB1.1) device through the hub, it could barely play, and not record at
> all. Connected directly to a USB2 port, it plays and records fine.
>
> So original poster just might be dealing with an internal hub.

That usb hub stuff seems to be really strange. I do have an external
hub, but I only use it for HDs.
The USB interface is connected directly to one of the laptops ports.

The laptop seems to have an internal hub, or two?
Anyway, it works just fine, as far as I can tell. Some jack2 test I ran
showed quite immense jitter, but I guess that's normal with USB devices.

$ lsusb
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 002: ID 0582:0074 Roland Corp. EDIROL UA-25
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

-- 
Philipp
--
"Wir stehen selbst enttäuscht und sehn betroffen / Den Vorhang zu
und alle Fragen offen." Bertolt Brecht, Der gute Mensch von Sezuan
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