On Fri, Oct 08, 2010 at 08:26:52AM +0200, Clemens Ladisch wrote: > Felix Homann wrote: > > @Daniel: > > You asked for the output of lsusb. Are you thinking of modifying the > > UA-101 driver yourself? Or something more generic? > > I guess he wanted to look for UAC2 descriptors (which this device does > not have). Actually, I wanted to check whether the device marks the inbound (capture) endpoint as isochronous with implicit data feedback usage. Which it doesn't either. > When (if) the driver has UAC2 implicit feedback support, it's easy to > add a simple quirk that makes the FTU work. (In that case, the UA-101 > driver can be merged back, too.) I wonder if we can always fall back to implicit feedback in case a playback substream does not have a syncpipe and does not have its fill_max bit set. Felix, can you add a printk(KERN_WARNING "%s() is_playback %d fill_max %d syncpipe %d\n", __func__, is_playback, subs->fill_max, subs->syncpipe); at the end of set_format() in pcm.c and send us the output? I have an untested patch ready which should add support for implicit feedback, but I'm uncertain about the condition when to activate this mode. Daniel _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
