[PD] alsa and jack on ARM/Wandbaord

katja katjavetter at gmail.com
Sun Sep 22 22:00:39 CEST 2013

Hello Chris,

It may be unrelated but with Debian Squeeze on particular Intel laptops
(Panasonic CF-74 and CF-19) I've always experienced that same problem:
recording works, playback works, but no duplex sound from Pd or Jack out of
the box. In these cases it was a matter of unchecking as many unused
options as possible in the ALSA mixer, in particular 'IEC958 Default PCM'
(don't know if you have that option). That used to make the difference
every time though I still don't know why.


On Sun, Sep 22, 2013 at 9:00 PM, Chris Clepper <cgclepper at gmail.com> wrote:

> I've got a Wandboard* here for some testing and I can't get Alsa to work
> in duplex.  Testing with arecord produces a soundfile and aplay plays it
> back.  But starting Pd with Alsa or jack gives the dreaded errors about the
> resource being in use.  Pd's performance with just playback is pretty good
> - pvoc example takes 20% cpu at 10ms latency - but I want to process some
> audio input!
> I built my own armhf kernel (much faster than armel) and have a very basic
> Ubuntu filesystem in place.  There's no obvious process like pulseaudio
> grabbing the audio hardware either.  Jack has all of the limits.conf set
> high.
> The audio device is sgtl5000 from Freescale.
> What's the usual setup and troubleshooting process for Pd on Linux these
> days?  Seems like these things are mostly sorted on x86, so maybe the
> problem is driver or armhf related.
> Thanks!
> *Dual Cortex A9 box for $100: http://wandboard.org/
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