[alsa-devel] Audiophile Delta 24/96 Midi Out continuously sends zeroes (alsa 1.0.14)

Romain Bossart romain.bossart at free.fr
Mon Sep 3 18:53:08 CEST 2007

Clemens Ladisch wrote:
> Romain Bossart wrote:
>> Selon Clemens Ladisch <cladisch at fastmail.net>:
>>> That is, the zeroes are _not_ sent when you're not using jack?  When
>>> nothing is connected, or when you use aplaymidi or amidi to send
>>> something, everything is OK?
>> Here is a summary of the various tests I did. I have just one card: Audiophile
>> Delta 24/96. My kernel is now RT patched & alsa 1.0.14,
>> Audio works perfectly. I don't think jack is the problem.
>> Config #2 = Delta Midi Out -> (Midi In) Instrument (Midi Out/Thru) -> Delta Midi
>> In and 'amidi -p hw:0,0 -d'. Jack being started or not.
>> Symptoms: tons of zeroes are shown by amidi as soon as I launch it. The stream
>> is so intense I can actually hear it in my speakers/monitors (need to switch to
>> better MIDI cables, I know!). amidi and /proc/asound/card0/midi0 give the same number
>> of transmitted bytes.
> With "transmitted", you meant "received"?
> When Jack is not running, there is no software to send anything.  If the number
> of _transmitted_ bytes changes anyway, this would be a bug in ALSA.
Oops, 'reveived' is correct. Thank you.

>> Config #2b = Delta Midi Out -> Delta Midi In
>> and 'amidi -p hw:0,0 -d', Jack being started or not.
>> Symptoms: identical to config#2. Moreover, if meanwhile I send some Midi commands
>> with amidi ('amidi -p hw:0,0 -S C01C'), I don't find this data in my dump.
> Apparently, the output port is broken.  While it is theoretically
> possible that the driver doesn't initialize the card correctly, I cannot
> imagine a bug that would cause the port to presume that there is data to
> send.
You're right the output port seems to be broken.

> Could you test if the port sends data even before the driver (or Linux)
> is loaded, or in Windows?

I am not sure I can try this. I will change my card.

> Regards,
> Clemens
Thank you very much for your help.


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