Re: [Alsa-user] USB Audio/Midiman - partial success

Re: [Alsa-user] USB Audio/Midiman - partial success

[Takashi Iwai]

At Sat, 7 Sep 2002 16:07:15 -0700 (PDT),
Fedor G. Pikus <fedorp@wv.mentorg.com> wrote:
> 
> I got something out of the Midiman Duo, but still not quite as good as
> under Windows:
> 
> If I use usb-uhci module for my USB controller, I get 2 PCMs, pcm0
> supports recording at 44.1KHz (arecord -f cd), and works fine.
> pcm1 supports recording at 44.1KHz ok, and also at 48KHz, but when I try
> that, I get this in the log:
> usb-uhci.c: interrupt, status 2, frame# 1646
> ALSA ../alsa-kernel/usb/usbaudio.c:628: timeout: still 5 active urbs..
> usb_control/bulk_msg: timeout
> usb.c: USB disconnect on device 4
> And after this I have no USB at all until reboot. USB mouse does not work,
> nothing.

this might be because you got xrun, and there was a problem in
usb-audio driver in this regard.  please try the cvs version.  the
hang-up should have been fixed.

also, Patrick reported that the capture works firstly after playing
(setting up) the playback device before capture on his quattro.
your device may have a similar problem.

> 
> If instead I use uhci module, I get only one PCM, pcm0, and it supports
> 44.1KHz, and works fine.
> 
> Why doesn't 48KHz work, and where are higher rates, where is 24bit
> recording?

hmm, uhci driver cannot get the whole descriptor properly in
comparison with usb-uhci driver.
please compares the outputs of lsusb from both modules.


Takashi


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