25 May
2011
25 May
'11
11:19 a.m.
http://lists.linuxaudio.org/pipermail/linux-audio-user/2010-June/070353.html
So not mixing USB1 and USB2 devices but mixing a device performing
Full-Speed isochronous-out transactions with a device performing
asynchronous transactions. I've tested my Edirol UA-25 with this chipset
too and no matter what I tried, full duplex wouldn't work. Does your
machine have a Rate Matching Hub? If so could this be the device that
does asynchronous transactions maybe? Just guessing here. Or is USB2
isochronous and USB1 asynchronous?
I read this bug description by Intel, and the sentence that decided me
to buy a USB2 soundcard is this:
"High-Speed and Low-Speed USB devices are not impacted by this issue."
I actually have an Edirol UA-25Ex that plainly doeson't work on these
USB ports, so I went for the M-Audio USB2 High-Speed hoping that would
solve the problem!