[alsa-devel] Need expert's advice - Fast Track Ultra (8R) dropping samples

Felix Homann linuxaudio at showlabor.de
Wed Oct 13 09:47:13 CEST 2010

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,


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