New subject: USB device dmesg error

20 Sep 2013

tom(a)trellis.ch wrote:
...
  -> the "Couldn't open device" looks
suspicious 
I guess you are not root.

...
          bmAttributes           37
           Transfer Type            Isochronous
           Synch Type               Asynchronous
           Usage Type               Implicit feedback Data 
...
   I guess this
is one of the devices that use implicit feedback
 synchronization, which is very buggy in the current driver.  As far as
 I know, only Jack works with these devices. 
 Huh? How could that work with JACK if it doesn't with ALSA? 
Jack uses ALSA; that driver code was tested only with Jack, and
expects the playback and capture streams to be opened at the same
time.

...
  Btw, this is what i get when trying to start JACK with
it:

 ATTENTION: The capture device "hw:0,0" is already in use. The following
 applications  are using your soundcard(s) so you should  check them and
 stop them as necessary before  trying to start JACK again:

 jackd (process ID 2341) 
Even more bugginess.  Maybe try the other Jack.

A patch series that should fix the bugs was posted on alsa-devel:
http://mailman.alsa-project.org/pipermail/alsa-devel/2013-August/065744.html

Regards,
Clemens

Re: [LAD] USB device dmesg error