[alsa-devel] USB asynchronous mode feedback format

Clemens Ladisch clemens at ladisch.de
Fri Oct 15 16:34:31 CEST 2010

Julian Scheel wrote:
> 11:1:1: endpoint lacks sample rate attribute bit, cannot set.
> Does not seem to be feedback related... Although it would be nice to know, 
> what's wrong there?

What's wrong is
1) that the driver complains about something that isn't wrong, and
2) that you're using a driver more than three months old, which is when
   I killed that message.  ;-)

> Is there any way to get some more verbosity out of alsa drivers? To check if
> it really receives the feedback information at all.

grep "Momentary freq" /proc/asounc/cardX/stream0

Or put a log message into retire_playback_sync_urb*().


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