Sorry, in my haste, I mistakenly wrote: > For me, silence due to the wrong line takes the form of unheard output > playback, while still working for input capture, so I'm not sure this has > any bearing on your issue. > Output playback silence occurred in one device (Roland INTEGRA-7 on higher sample rates) which had the line IMPLICIT_FB_FIXED_DEV and needed IMPLICIT_FB_BOTH_DEV. So it's the opposite situation. Capture issues, such as yours, with arecord were exactly what I saw when a device used IMPLICIT_FB_BOTH_DEV while needing IMPLICIT_FB_FIXED_DEV instead. Here's one of my previous examples of a device not compatible with IMPLICIT_FB_BOTH_DEV: > Roland VG-99 doesn't capture, but plays well: > arecord -D hw:VG99 -f S24_3LE -r 44100 -c 2 ./file.wav > Recording WAVE './file.wav' : Signed 24 bit Little Endian in 3bytes, Rate > 44100 Hz, Stereo > arecord: xrun:1672: read/write error, state = PREPARED > > aplay -D hw:VG99 -f S24_3LE -r 44100 -c 2 ./other-file.wav > Playing WAVE './other-file.wav' : Signed 24 bit Little Endian in 3bytes, > Rate 44100 Hz, Stereo > I'm sorry if that caused confusion. It does seem your issue could be the very same as the VG-99's above. That is, a device without "Asynchronous" "Synch Type" for either of its "IN" or "OUT" endpoints. In that case, IMPLICIT_FB_FIXED_DEV should work. Thanks, and sorry, Lucas
