[LAD] Call for testing (final): ALSA driver for some firewire devices

Takashi Sakamoto o-takashi at sakamocchi.jp
Tue May 6 11:42:12 UTC 2014

Hi Matt,

(May 06 2014 07:33), M Murdock wrote:
> Now... what can I do to help debug MIDI communication with the ProjectMix?
> This is an important feature for me as half of the hardware functionality is
> as a control surface.

I'm not sure your ProjectMix I/O has this issue or not because this is 
my assumption from behaviour of Firewire 1814. Firewire 1814 and 
ProjectMix I/O are quite similar. So at first I ask you to confirm 
ProjectMix I/O really has this issue.

If ProjectMix I/O has buffer overflow for MIDI messages, it transmits 
packets with discontinuity. ALSA driver can detect it and report it to 
kernel: [19757.225489] snd-bebob fw1.0: Detect discontinuity of CIP: E8 40

So please confirm to see such logs when sending much MIDI messages to 
your ProjectMix I/O.


Takashi Sakamoto
o-takashi at sakamocchi.jp

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