From mboxrd@z Thu Jan  1 00:00:00 1970
From: Felix Homann <linuxaudio@showlabor.de>
Subject: Re: Need expert's advice - Fast Track Ultra (8R)
 dropping samples
Date: Wed, 13 Oct 2010 09:47:13 +0200
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To: Daniel Mack <daniel@caiaq.de>
Cc: tiwai@suse.de, alsa-devel@alsa-project.org, Clemens Ladisch <clemens@ladisch.de>
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Am 12.10.2010 12:26, schrieb Daniel Mack:
>
> Thanks for testing!
>
>    

Thanks for *your* help on *my* problem!!!



>
> I attached a patch below, only compile-tested. Please also check the USB
> ID again, as I'm not sure whether you sent the right lsusb dump (the
> device name looks suspicious).
>    

Yes, it's been the right lsusb dump. The reported device name is a bit 
strange indeed. In /proc/asound it is listed as F8R which is is a bit 
more reasonable.


> If that doesn't work, try debugging the value returned by
> urb.c:snd_usb_audio_next_packet_size(). For your device, you should end
> up in the "subs->stream->implicit_feedback" branch.
>
>    

I've tested your patch. Unfortunately I don't get any sound. 
snd_usb_audio_next_packet_size() returns from the 
"subs->stream->implicit_feedback" branch. But the return value is always 
0. ('frames' is returned, not the  0 from the if (WARN_ONCE...) statement).

Any ideas how to proceed?

Thank you very much again,

Felix